-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)=0

We get rid of parentheses

12a-42=0

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

12a=42

a=42/12

a=3+1/2

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