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3m+12=-(3-8)
We move all terms to the left:
3m+12-(-(3-8))=0
We add all the numbers together, and all the variables
3m+12-(-(-5))=0
We add all the numbers together, and all the variables
3m+7=0
We move all terms containing m to the left, all other terms to the right
3m=-7
m=-7/3
m=-2+1/3
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