(-5a)-(-7a)+(-6a)=-12

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Solution for (-5a)-(-7a)+(-6a)=-12 equation: 



(-5a)-(-7a)+(-6a)=-12

We move all terms to the left:

(-5a)-(-7a)+(-6a)-(-12)=0

We add all the numbers together, and all the variables

(-5a)-(-7a)+(-6a)+12=0

We get rid of parentheses

-5a+7a-6a+12=0

We add all the numbers together, and all the variables

-4a+12=0

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

-4a=-12

a=-12/-4

a=+3

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