3a-7a=-12

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Solution for 3a-7a=-12 equation: 



3a-7a=-12

We move all terms to the left:

3a-7a-(-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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