2r-7r=+15

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Solution for 2r-7r=+15 equation: 



2r-7r=+15

We move all terms to the left:

2r-7r-(+15)=0

We add all the numbers together, and all the variables

2r-7r-15=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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