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-10(m-12)=140
We move all terms to the left:
-10(m-12)-(140)=0
We multiply parentheses
-10m+120-140=0
We add all the numbers together, and all the variables
-10m-20=0
We move all terms containing m to the left, all other terms to the right
-10m=20
m=20/-10
m=-2
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