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8m-4=5m+20
We move all terms to the left:
8m-4-(5m+20)=0
We get rid of parentheses
8m-5m-20-4=0
We add all the numbers together, and all the variables
3m-24=0
We move all terms containing m to the left, all other terms to the right
3m=24
m=24/3
m=8
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