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12-2m-8m=-7m+8+1
We move all terms to the left:
12-2m-8m-(-7m+8+1)=0
We add all the numbers together, and all the variables
-2m-8m-(-7m+9)+12=0
We add all the numbers together, and all the variables
-10m-(-7m+9)+12=0
We get rid of parentheses
-10m+7m-9+12=0
We add all the numbers together, and all the variables
-3m+3=0
We move all terms containing m to the left, all other terms to the right
-3m=-3
m=-3/-3
m=1
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