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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3a-6-21=0

We add all the numbers together, and all the variables

3a-27=0

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

3a=27

a=27/3

a=9

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