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 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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