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100+.20m=50+.70m
We move all terms to the left:
100+.20m-(50+.70m)=0
We add all the numbers together, and all the variables
.20m-(.70m+50)+100=0
We get rid of parentheses
.20m-.70m-50+100=0
We add all the numbers together, and all the variables
-0.5m+50=0
We move all terms containing m to the left, all other terms to the right
-0.5m=-50
m=-50/-0.5
m=+100
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