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8(m-3)-2(-2m+4)=20
We move all terms to the left:
8(m-3)-2(-2m+4)-(20)=0
We multiply parentheses
8m+4m-24-8-20=0
We add all the numbers together, and all the variables
12m-52=0
We move all terms containing m to the left, all other terms to the right
12m=52
m=52/12
m=4+1/3
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