3a+42=9a-12

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Solution for 3a+42=9a-12 equation: 



3a+42=9a-12

We move all terms to the left:

3a+42-(9a-12)=0

We get rid of parentheses

3a-9a+12+42=0

We add all the numbers together, and all the variables

-6a+54=0

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

-6a=-54

a=-54/-6

a=+9

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