1=r/9+2

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Solution for 1=r/9+2 equation: 


r in (-oo:+oo)

1 = r/9+2 // - r/9+2

1-(r/9)-2 = 0

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

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

r = 1/(-1/9)

r = -9

r = -9

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