2r-8+5r=-15

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Solution for 2r-8+5r=-15 equation: 



2r-8+5r=-15

We move all terms to the left:

2r-8+5r-(-15)=0

We add all the numbers together, and all the variables

7r+7=0

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

7r=-7

r=-7/7

r=-1

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