-2m+3=-21

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Solution for -2m+3=-21 equation: 



-2m+3=-21

We move all terms to the left:

-2m+3-(-21)=0

We add all the numbers together, and all the variables

-2m+24=0

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

-2m=-24

m=-24/-2

m=+12

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