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-3(m-10)-4(-7+6m)=-77
We move all terms to the left:
-3(m-10)-4(-7+6m)-(-77)=0
We add all the numbers together, and all the variables
-3(m-10)-4(6m-7)-(-77)=0
We add all the numbers together, and all the variables
-3(m-10)-4(6m-7)+77=0
We multiply parentheses
-3m-24m+30+28+77=0
We add all the numbers together, and all the variables
-27m+135=0
We move all terms containing m to the left, all other terms to the right
-27m=-135
m=-135/-27
m=+5
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