15r-15=7r+25

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Solution for 15r-15=7r+25 equation: 



15r-15=7r+25

We move all terms to the left:

15r-15-(7r+25)=0

We get rid of parentheses

15r-7r-25-15=0

We add all the numbers together, and all the variables

8r-40=0

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

8r=40

r=40/8

r=5

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