-6(-3+7a)=-3a-21

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Solution for -6(-3+7a)=-3a-21 equation: 



-6(-3+7a)=-3a-21

We move all terms to the left:

-6(-3+7a)-(-3a-21)=0

We add all the numbers together, and all the variables

-6(7a-3)-(-3a-21)=0

We multiply parentheses

-42a-(-3a-21)+18=0

We get rid of parentheses

-42a+3a+21+18=0

We add all the numbers together, and all the variables

-39a+39=0

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

-39a=-39

a=-39/-39

a=1

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