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100+.40m=20+.9m
We move all terms to the left:
100+.40m-(20+.9m)=0
We add all the numbers together, and all the variables
.40m-(.9m+20)+100=0
We get rid of parentheses
.40m-.9m-20+100=0
We add all the numbers together, and all the variables
-0.5m+80=0
We move all terms containing m to the left, all other terms to the right
-0.5m=-80
m=-80/-0.5
m=+160
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