15.6=3.9r

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Solution for 15.6=3.9r equation: 



15.6=3.9r

We move all terms to the left:

15.6-(3.9r)=0

We add all the numbers together, and all the variables

-(+3.9r)+15.6=0

We get rid of parentheses

-3.9r+15.6=0

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

-3.9r=-15.6

r=-15.6/-3.9

r=+4

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