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

7a+21=0

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

7a=-21

a=-21/7

a=-3

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