In the expression c - b = a then c is called the minuend, b is called the subtrahend and a is known as the difference (or result or answer).
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Equal quantities.
no
Only like terms can be added or subtracted. 10m and 1s cannot be added; but divided, 10 m/s becomes a velocity.
Yes, that's true. Basically you can multiply and divide them; but you can't add, subtract, or compare them.
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.