8=5r-7

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Solution for 8=5r-7 equation: 



8=5r-7

We move all terms to the left:

8-(5r-7)=0

We get rid of parentheses

-5r+7+8=0

We add all the numbers together, and all the variables

-5r+15=0

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

-5r=-15

r=-15/-5

r=+3

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