15=r/-2

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Solution for 15=r/-2 equation: 


r in (-oo:+oo)

15 = r/(-2) // - r/(-2)

15-(r/(-2)) = 0

1/2*r+15 = 0 // - 15

1/2*r = -15 // : 1/2

r = -15/1/2

r = -30

r = -30

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