-3(a+7)=-4a

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



-3(a+7)=-4a

We move all terms to the left:

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

We multiply parentheses

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

We get rid of parentheses

-3a+4a-21=0

We add all the numbers together, and all the variables

a-21=0

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

a=21

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