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-8(-7+8m)+5(-m+7)=-47
We move all terms to the left:
-8(-7+8m)+5(-m+7)-(-47)=0
We add all the numbers together, and all the variables
-8(8m-7)+5(-1m+7)-(-47)=0
We add all the numbers together, and all the variables
-8(8m-7)+5(-1m+7)+47=0
We multiply parentheses
-64m-5m+56+35+47=0
We add all the numbers together, and all the variables
-69m+138=0
We move all terms containing m to the left, all other terms to the right
-69m=-138
m=-138/-69
m=+2
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