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120+0.20m=70+0.40m
We move all terms to the left:
120+0.20m-(70+0.40m)=0
We add all the numbers together, and all the variables
0.20m-(0.40m+70)+120=0
We get rid of parentheses
0.20m-0.40m-70+120=0
We add all the numbers together, and all the variables
-0.2m+50=0
We move all terms containing m to the left, all other terms to the right
-0.2m=-50
m=-50/-0.2
m=+250
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