39=3+4r

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Solution for 39=3+4r equation: 



39=3+4r

We move all terms to the left:

39-(3+4r)=0

We add all the numbers together, and all the variables

-(4r+3)+39=0

We get rid of parentheses

-4r-3+39=0

We add all the numbers together, and all the variables

-4r+36=0

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

-4r=-36

r=-36/-4

r=+9

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