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3m+8=-5m-8
We move all terms to the left:
3m+8-(-5m-8)=0
We get rid of parentheses
3m+5m+8+8=0
We add all the numbers together, and all the variables
8m+16=0
We move all terms containing m to the left, all other terms to the right
8m=-16
m=-16/8
m=-2
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