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-2(m+1)=28
We move all terms to the left:
-2(m+1)-(28)=0
We multiply parentheses
-2m-2-28=0
We add all the numbers together, and all the variables
-2m-30=0
We move all terms containing m to the left, all other terms to the right
-2m=30
m=30/-2
m=-15
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