3r+15=5r-25

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Solution for 3r+15=5r-25 equation: 



3r+15=5r-25

We move all terms to the left:

3r+15-(5r-25)=0

We get rid of parentheses

3r-5r+25+15=0

We add all the numbers together, and all the variables

-2r+40=0

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

-2r=-40

r=-40/-2

r=+20

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