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8(2+7m)+4(5m-4)=-76
We move all terms to the left:
8(2+7m)+4(5m-4)-(-76)=0
We add all the numbers together, and all the variables
8(7m+2)+4(5m-4)-(-76)=0
We add all the numbers together, and all the variables
8(7m+2)+4(5m-4)+76=0
We multiply parentheses
56m+20m+16-16+76=0
We add all the numbers together, and all the variables
76m+76=0
We move all terms containing m to the left, all other terms to the right
76m=-76
m=-76/76
m=-1
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