12-2m=90

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Solution for 12-2m=90 equation: 



12-2m=90

We move all terms to the left:

12-2m-(90)=0

We add all the numbers together, and all the variables

-2m-78=0

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

-2m=78

m=78/-2

m=-39

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