-42=-2a+9a

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Solution for -42=-2a+9a equation: 



-42=-2a+9a

We move all terms to the left:

-42-(-2a+9a)=0

We add all the numbers together, and all the variables

-(+7a)-42=0

We get rid of parentheses

-7a-42=0

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

-7a=42

a=42/-7

a=-6

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