40=0.2r

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Solution for 40=0.2r equation: 



40=0.2r

We move all terms to the left:

40-(0.2r)=0

We add all the numbers together, and all the variables

-(+0.2r)+40=0

We get rid of parentheses

-0.2r+40=0

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

-0.2r=-40

r=-40/-0.2

r=+200

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