15=-4m-21

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Solution for 15=-4m-21 equation: 



15=-4m-21

We move all terms to the left:

15-(-4m-21)=0

We get rid of parentheses

4m+21+15=0

We add all the numbers together, and all the variables

4m+36=0

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

4m=-36

m=-36/4

m=-9

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