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1+7(12+10m)=-265
We move all terms to the left:
1+7(12+10m)-(-265)=0
We add all the numbers together, and all the variables
7(10m+12)+1-(-265)=0
We add all the numbers together, and all the variables
7(10m+12)+266=0
We multiply parentheses
70m+84+266=0
We add all the numbers together, and all the variables
70m+350=0
We move all terms containing m to the left, all other terms to the right
70m=-350
m=-350/70
m=-5
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