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-4(m+7)+7(8m+2)=38
We move all terms to the left:
-4(m+7)+7(8m+2)-(38)=0
We multiply parentheses
-4m+56m-28+14-38=0
We add all the numbers together, and all the variables
52m-52=0
We move all terms containing m to the left, all other terms to the right
52m=52
m=52/52
m=1
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