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40+7.50m=12.50m
We move all terms to the left:
40+7.50m-(12.50m)=0
We add all the numbers together, and all the variables
7.50m-(+12.50m)+40=0
We get rid of parentheses
7.50m-12.50m+40=0
We add all the numbers together, and all the variables
-5m+40=0
We move all terms containing m to the left, all other terms to the right
-5m=-40
m=-40/-5
m=+8
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