100+.4m=20+.5m

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Solution for 100+.4m=20+.5m equation: 



100+.4m=20+.5m

We move all terms to the left:

100+.4m-(20+.5m)=0

We add all the numbers together, and all the variables

.4m-(.5m+20)+100=0

We get rid of parentheses

.4m-.5m-20+100=0

We add all the numbers together, and all the variables

-0.1m+80=0

We move all terms containing m to the left, all other terms to the right

-0.1m=-80

m=-80/-0.1

m=+800

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