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5m-5(8m+3)=20
We move all terms to the left:
5m-5(8m+3)-(20)=0
We multiply parentheses
5m-40m-15-20=0
We add all the numbers together, and all the variables
-35m-35=0
We move all terms containing m to the left, all other terms to the right
-35m=35
m=35/-35
m=-1
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