9=r/9

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Solution for 9=r/9 equation: 


r in (-oo:+oo)

9 = r/9 // - r/9

9-(r/9) = 0

9-1/9*r = 0 // - 9

-1/9*r = -9 // : -1/9

r = -9/(-1/9)

r = 81

r = 81

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