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12+80m=10+90m
We move all terms to the left:
12+80m-(10+90m)=0
We add all the numbers together, and all the variables
80m-(90m+10)+12=0
We get rid of parentheses
80m-90m-10+12=0
We add all the numbers together, and all the variables
-10m+2=0
We move all terms containing m to the left, all other terms to the right
-10m=-2
m=-2/-10
m=1/5
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