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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