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10(m-5)=-80
We move all terms to the left:
10(m-5)-(-80)=0
We add all the numbers together, and all the variables
10(m-5)+80=0
We multiply parentheses
10m-50+80=0
We add all the numbers together, and all the variables
10m+30=0
We move all terms containing m to the left, all other terms to the right
10m=-30
m=-30/10
m=-3
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