-81=r/-9

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Solution for -81=r/-9 equation: 


r in (-oo:+oo)

-81 = r/(-9) // - r/(-9)

-(r/(-9))-81 = 0

1/9*r-81 = 0 // + 81

1/9*r = 81 // : 1/9

r = 81/1/9

r = 729

r = 729

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