7a+6-3a=a-21

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



7a+6-3a=a-21

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

4a-a+21+6=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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