7r-15=5r-7

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Solution for 7r-15=5r-7 equation: 



7r-15=5r-7

We move all terms to the left:

7r-15-(5r-7)=0

We get rid of parentheses

7r-5r+7-15=0

We add all the numbers together, and all the variables

2r-8=0

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

2r=8

r=8/2

r=4

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