18=r/7

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Solution for 18=r/7 equation: 


r in (-oo:+oo)

18 = r/7 // - r/7

18-(r/7) = 0

18-1/7*r = 0 // - 18

-1/7*r = -18 // : -1/7

r = -18/(-1/7)

r = 126

r = 126

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