-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-18=0

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

-2m=18

m=18/-2

m=-9

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