2m-5m=12-21

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Solution for 2m-5m=12-21 equation: 



2m-5m=12-21

We move all terms to the left:

2m-5m-(12-21)=0

We add all the numbers together, and all the variables

2m-5m-(-9)=0

We add all the numbers together, and all the variables

-3m+9=0

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

-3m=-9

m=-9/-3

m=+3

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