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-7(8m+8)=280
We move all terms to the left:
-7(8m+8)-(280)=0
We multiply parentheses
-56m-56-280=0
We add all the numbers together, and all the variables
-56m-336=0
We move all terms containing m to the left, all other terms to the right
-56m=336
m=336/-56
m=-6
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