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120+40m=180+20m
We move all terms to the left:
120+40m-(180+20m)=0
We add all the numbers together, and all the variables
40m-(20m+180)+120=0
We get rid of parentheses
40m-20m-180+120=0
We add all the numbers together, and all the variables
20m-60=0
We move all terms containing m to the left, all other terms to the right
20m=60
m=60/20
m=3
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