15=5r+45

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Solution for 15=5r+45 equation: 



15=5r+45

We move all terms to the left:

15-(5r+45)=0

We get rid of parentheses

-5r-45+15=0

We add all the numbers together, and all the variables

-5r-30=0

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

-5r=30

r=30/-5

r=-6

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