-66=12a+42

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Solution for -66=12a+42 equation: 



-66=12a+42

We move all terms to the left:

-66-(12a+42)=0

We get rid of parentheses

-12a-42-66=0

We add all the numbers together, and all the variables

-12a-108=0

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

-12a=108

a=108/-12

a=-9

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