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3m-(-8m)=(-11)
We move all terms to the left:
3m-(-8m)-((-11))=0
We add all the numbers together, and all the variables
3m-(-8m)+11=0
We get rid of parentheses
3m+8m+11=0
We add all the numbers together, and all the variables
11m+11=0
We move all terms containing m to the left, all other terms to the right
11m=-11
m=-11/11
m=-1
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