-3(a+7)+4a+21=7

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Solution for -3(a+7)+4a+21=7 equation: 



-3(a+7)+4a+21=7

We move all terms to the left:

-3(a+7)+4a+21-(7)=0

We add all the numbers together, and all the variables

4a-3(a+7)+14=0

We multiply parentheses

4a-3a-21+14=0

We add all the numbers together, and all the variables

a-7=0

We move all terms containing a to the left, all other terms to the right

a=7

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