315=15+10r

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Solution for 315=15+10r equation: 



315=15+10r

We move all terms to the left:

315-(15+10r)=0

We add all the numbers together, and all the variables

-(10r+15)+315=0

We get rid of parentheses

-10r-15+315=0

We add all the numbers together, and all the variables

-10r+300=0

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

-10r=-300

r=-300/-10

r=+30

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