5r-6+2r=15

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Solution for 5r-6+2r=15 equation: 



5r-6+2r=15

We move all terms to the left:

5r-6+2r-(15)=0

We add all the numbers together, and all the variables

7r-21=0

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

7r=21

r=21/7

r=3

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