-3r-7+5r=-15

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Solution for -3r-7+5r=-15 equation: 



-3r-7+5r=-15

We move all terms to the left:

-3r-7+5r-(-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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