7-2a=21

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Solution for 7-2a=21 equation:


7-2a=21

We simplify the equation to the form, which is simple to understand 
7-2a=21

We move all terms containing a to the left and all other terms to the right. 
-2a=+21-7

We simplify left and right side of the equation. 
-2a=+14

We divide both sides of the equation by -2 to get a. 
a=-7

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