3m-5-7m=-21

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Solution for 3m-5-7m=-21 equation: 



3m-5-7m=-21

We move all terms to the left:

3m-5-7m-(-21)=0

We add all the numbers together, and all the variables

-4m+16=0

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

-4m=-16

m=-16/-4

m=+4

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