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10m+250=12m+90
We move all terms to the left:
10m+250-(12m+90)=0
We get rid of parentheses
10m-12m-90+250=0
We add all the numbers together, and all the variables
-2m+160=0
We move all terms containing m to the left, all other terms to the right
-2m=-160
m=-160/-2
m=+80
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