-42=9a+3a-6

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Solution for -42=9a+3a-6 equation: 



-42=9a+3a-6

We move all terms to the left:

-42-(9a+3a-6)=0

We add all the numbers together, and all the variables

-(12a-6)-42=0

We get rid of parentheses

-12a+6-42=0

We add all the numbers together, and all the variables

-12a-36=0

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

-12a=36

a=36/-12

a=-3

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