-3.a=12

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Solution for -3.a=12 equation: 



-3.a=12

We move all terms to the left:

-3.a-(12)=0

We add all the numbers together, and all the variables

-3a-12=0

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

-3a=12

a=12/-3

a=-4

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