-15-m=-21

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Solution for -15-m=-21 equation: 



-15-m=-21

We move all terms to the left:

-15-m-(-21)=0

We add all the numbers together, and all the variables

-1m+6=0

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

-m=-6

m=-6/-1

m=+6

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