3/9=r/81

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Solution for 3/9=r/81 equation: 


r in (-oo:+oo)

3/9 = r/81 // - r/81

3/9-(r/81) = 0

1/3-1/81*r = 0 // - 1/3

-1/81*r = -1/3 // : -1/81

r = -1/3/(-1/81)

r = 27

r = 27

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