-4a=-21-7a

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Solution for -4a=-21-7a equation: 



-4a=-21-7a

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-4a+7a+21=0

We add all the numbers together, and all the variables

3a+21=0

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

3a=-21

a=-21/3

a=-7

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