-42=12a+18

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Solution for -42=12a+18 equation: 



-42=12a+18

We move all terms to the left:

-42-(12a+18)=0

We get rid of parentheses

-12a-18-42=0

We add all the numbers together, and all the variables

-12a-60=0

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

-12a=60

a=60/-12

a=-5

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