64=0.4r

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Solution for 64=0.4r equation: 



64=0.4r

We move all terms to the left:

64-(0.4r)=0

We add all the numbers together, and all the variables

-(+0.4r)+64=0

We get rid of parentheses

-0.4r+64=0

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

-0.4r=-64

r=-64/-0.4

r=+160

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