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-3m+2(2+)=-1
We move all terms to the left:
-3m+2(2+)-(-1)=0
We add all the numbers together, and all the variables
-3m+20-(-1)=0
We add all the numbers together, and all the variables
-3m+21=0
We move all terms containing m to the left, all other terms to the right
-3m=-21
m=-21/-3
m=+7
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