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3m+8=-5m-64

We move all terms to the left:

3m+8-(-5m-64)=0

We get rid of parentheses

3m+5m+64+8=0

We add all the numbers together, and all the variables

8m+72=0

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

8m=-72

m=-72/8

m=-9

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