6.4=0.8r

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Solution for 6.4=0.8r equation: 



6.4=0.8r

We move all terms to the left:

6.4-(0.8r)=0

We add all the numbers together, and all the variables

-(+0.8r)+6.4=0

We get rid of parentheses

-0.8r+6.4=0

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

-0.8r=-6.4

r=-6.4/-0.8

r=+8

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