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40m+600=60m+300
We move all terms to the left:
40m+600-(60m+300)=0
We get rid of parentheses
40m-60m-300+600=0
We add all the numbers together, and all the variables
-20m+300=0
We move all terms containing m to the left, all other terms to the right
-20m=-300
m=-300/-20
m=+15
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