7(3a+1)-2a=-12

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Solution for 7(3a+1)-2a=-12 equation: 



7(3a+1)-2a=-12

We move all terms to the left:

7(3a+1)-2a-(-12)=0

We add all the numbers together, and all the variables

-2a+7(3a+1)+12=0

We multiply parentheses

-2a+21a+7+12=0

We add all the numbers together, and all the variables

19a+19=0

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

19a=-19

a=-19/19

a=-1

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