42=2(3a)+-12

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Solution for 42=2(3a)+-12 equation: 



42=2(3a)+-12

We move all terms to the left:

42-(2(3a)+-12)=0

We add all the numbers together, and all the variables

-(23a-12)+42=0

We get rid of parentheses

-23a+12+42=0

We add all the numbers together, and all the variables

-23a+54=0

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

-23a=-54

a=-54/-23

a=2+8/23

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