-3(a-1)+2(a+3)=12

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Solution for -3(a-1)+2(a+3)=12 equation: 



-3(a-1)+2(a+3)=12

We move all terms to the left:

-3(a-1)+2(a+3)-(12)=0

We multiply parentheses

-3a+2a+3+6-12=0

We add all the numbers together, and all the variables

-1a-3=0

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

-a=3

a=3/-1

a=-3

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