15r+-13r=-6

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Solution for 15r+-13r=-6 equation: 



15r+-13r=-6

We move all terms to the left:

15r+-13r-(-6)=0

We add all the numbers together, and all the variables

2r+6=0

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

2r=-6

r=-6/2

r=-3

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