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3(7+2m)=-15

We move all terms to the left:

3(7+2m)-(-15)=0

We add all the numbers together, and all the variables

3(2m+7)-(-15)=0

We add all the numbers together, and all the variables

3(2m+7)+15=0

We multiply parentheses

6m+21+15=0

We add all the numbers together, and all the variables

6m+36=0

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

6m=-36

m=-36/6

m=-6

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