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100+.40m=40+.70m
We move all terms to the left:
100+.40m-(40+.70m)=0
We add all the numbers together, and all the variables
.40m-(.70m+40)+100=0
We get rid of parentheses
.40m-.70m-40+100=0
We add all the numbers together, and all the variables
-0.3m+60=0
We move all terms containing m to the left, all other terms to the right
-0.3m=-60
m=-60/-0.3
m=+200
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