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

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

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

r = -15/(-1/2)

r = 30

r = 30

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