12-4a=-20

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Solution for 12-4a=-20 equation: 



12-4a=-20

We move all terms to the left:

12-4a-(-20)=0

We add all the numbers together, and all the variables

-4a+32=0

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

-4a=-32

a=-32/-4

a=+8

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