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-8(-5+m)=80
We move all terms to the left:
-8(-5+m)-(80)=0
We add all the numbers together, and all the variables
-8(m-5)-80=0
We multiply parentheses
-8m+40-80=0
We add all the numbers together, and all the variables
-8m-40=0
We move all terms containing m to the left, all other terms to the right
-8m=40
m=40/-8
m=-5
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