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m-2(m+1)=4
We move all terms to the left:
m-2(m+1)-(4)=0
We multiply parentheses
m-2m-2-4=0
We add all the numbers together, and all the variables
-1m-6=0
We move all terms containing m to the left, all other terms to the right
-m=6
m=6/-1
m=-6
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