2a+6=3a-21

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Solution for 2a+6=3a-21 equation: 



2a+6=3a-21

We move all terms to the left:

2a+6-(3a-21)=0

We get rid of parentheses

2a-3a+21+6=0

We add all the numbers together, and all the variables

-1a+27=0

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

-a=-27

a=-27/-1

a=+27

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