42=6+9r

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Solution for 42=6+9r equation: 



42=6+9r

We move all terms to the left:

42-(6+9r)=0

We add all the numbers together, and all the variables

-(9r+6)+42=0

We get rid of parentheses

-9r-6+42=0

We add all the numbers together, and all the variables

-9r+36=0

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

-9r=-36

r=-36/-9

r=+4

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