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4m-8=-2m+40
We move all terms to the left:
4m-8-(-2m+40)=0
We get rid of parentheses
4m+2m-40-8=0
We add all the numbers together, and all the variables
6m-48=0
We move all terms containing m to the left, all other terms to the right
6m=48
m=48/6
m=8
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