In any equation, regardless of the number adding or subtracting, multiplying or dividing, you must do the same to both sides. This ensures you are not changing the equation. If only one side was done, then the original equation has been altered and is no longer the same as it began. Changing both sides with the same values keeps all things equal.
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6 + 2x = x - 6 Subtract x from both sides: 6 + x = -6 Subtract 6 from both sides: x = -12
7a + 6 = -36 Subtract 6 from both sides: 7a = -42 Divide both sides by 7: a = -6 a = -6
5x + 2 = x + 6 Subtract x from both sides: 4x + 2 = 6 Subtract 2 from both sides: 4x = 4 Divide both sides by 4: x = 1
12 = 2x + 6 subtract 6 from both sides 6 = 2x divide both sides by 2 3 = x
2x + 6 = 9 (subtract 6 from both sides) 2x = 3 (divide both sides by two)x = 1.5