3.2=0.4r

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Solution for 3.2=0.4r equation: 



3.2=0.4r

We move all terms to the left:

3.2-(0.4r)=0

We add all the numbers together, and all the variables

-(+0.4r)+3.2=0

We get rid of parentheses

-0.4r+3.2=0

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

-0.4r=-3.2

r=-3.2/-0.4

r=+8

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