3+2m=21

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Solution for 3+2m=21 equation: 



3+2m=21

We move all terms to the left:

3+2m-(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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