-3a+21+5a=2a-7a

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Solution for -3a+21+5a=2a-7a equation: 



-3a+21+5a=2a-7a

We move all terms to the left:

-3a+21+5a-(2a-7a)=0

We add all the numbers together, and all the variables

-3a+5a-(-5a)+21=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

2a+5a+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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