-4a+6a-12=30

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Solution for -4a+6a-12=30 equation: 



-4a+6a-12=30

We move all terms to the left:

-4a+6a-12-(30)=0

We add all the numbers together, and all the variables

2a-42=0

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

2a=42

a=42/2

a=21

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