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-4(2m-4)=56
We move all terms to the left:
-4(2m-4)-(56)=0
We multiply parentheses
-8m+16-56=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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