8a-(a-7)=21

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Solution for 8a-(a-7)=21 equation:


8a-(a-7)=21

We simplify the equation to the form, which is simple to understand 
8a-(a-7)=21

Remove unnecessary parentheses
8a-1a+7=21

We move all terms containing a to the left and all other terms to the right. 
+8a-1a=+21-7

We simplify left and right side of the equation. 
+7a=+14

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

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