15=-r/3

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Solution for 15=-r/3 equation: 


r in (-oo:+oo)

15 = -r/3 // + -r/3

15-(-r/3) = 0

(1/3)*r+15 = 0

1/3*r+15 = 0 // - 15

1/3*r = -15 // : 1/3

r = -15/1/3

r = -45

r = -45

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