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You can add or subtract any quantity on both sides of an equation, without changing the equation's solution set. Just make sure you add or subtract the same thing on both sides.

Q: What kind of quantities can be added or subtracted from both sides of an equation?

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Equal quantities.

The size of the quantities involved doesn't matter. As long as you add or subtract (or divide or multiply) the same number to or from both sides of the equation, then the two sides remain equal.

Yes, the point is that if two terms (or sides of the equation) are equal, then they remain equal as long as you add or subtract the same amount, to or from both of them. It's very logical.

Equal quantities may be added to both sides of a linear equation.

for a polygon you use order of operations with this equation: [# of side subtracted by 2] multiply by 180= your answer

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Equal quantities.

Equal

Quantities that are equal can be added or subtracted from both sides of an equasion. For example: x + 2 = 36 subtract both sides by 2 x = 34

Identical quantities can be added (or subtracted) from each side. Each side can also be multiplied (or divided) by any quantity.

The size of the quantities involved doesn't matter. As long as you add or subtract (or divide or multiply) the same number to or from both sides of the equation, then the two sides remain equal.

Yes, the point is that if two terms (or sides of the equation) are equal, then they remain equal as long as you add or subtract the same amount, to or from both of them. It's very logical.

Equal quantities may be added to both sides of a linear equation.

The property is: If equals are subtracted from equals, the results are equal.

When a quantity is subtracted or added from both sides of an inequality, the true difference in value is varied thereby changing the direction of the inequality, but when rather than subtracted or added it is multiplied or divided, it preserves the true difference in value thereby facing the same direction as the initial inequality.

The "equal" sign (=) in an equation connects both sides of the equation, indicating that the expressions on either side have the same value. It denotes that the two sides are equal and balanced, showing the relationship between the quantities involved.

Without an equality sign it is not an equation but if you mean 18+m = 27 then by deducting 18 from both sides of the equation m = 9

Both sides of an equation are equal to each other, meaning that the quantities on the left side of the equal sign are the same as the quantities on the right side of the equal sign. This is the fundamental principle of solving equations in mathematics.