18=r/2

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Solution for 18=r/2 equation: 


r in (-oo:+oo)

18 = r/2 // - r/2

18-(r/2) = 0

18-1/2*r = 0 // - 18

-1/2*r = -18 // : -1/2

r = -18/(-1/2)

r = 36

r = 36

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