-1=8+R/9

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Solution for -1=8+R/9 equation: 


R in (-oo:+oo)

-1 = R/9+8 // - R/9+8

-(R/9)-8-1 = 0

-1/9*R-9 = 0 // + 9

-1/9*R = 9 // : -1/9

R = 9/(-1/9)

R = -81

R = -81

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