-2a+21+7a=4a-6a

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Solution for -2a+21+7a=4a-6a equation: 



-2a+21+7a=4a-6a

We move all terms to the left:

-2a+21+7a-(4a-6a)=0

We add all the numbers together, and all the variables

-2a+7a-(-2a)+21=0

We add all the numbers together, and all the variables

5a-(-2a)+21=0

We get rid of parentheses

5a+2a+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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