12-4m=20

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Solution for 12-4m=20 equation: 



12-4m=20

We move all terms to the left:

12-4m-(20)=0

We add all the numbers together, and all the variables

-4m-8=0

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

-4m=8

m=8/-4

m=-2

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