21=-a-3+7a

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Solution for 21=-a-3+7a equation:



21=-a-3+7a
We move all terms to the left:
21-(-a-3+7a)=0
We add all the numbers together, and all the variables
-(6a-3)+21=0
We get rid of parentheses
-6a+3+21=0
We add all the numbers together, and all the variables
-6a+24=0
We move all terms containing a to the left, all other terms to the right
-6a=-24
a=-24/-6
a=+4

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