5/20=r/9

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Solution for 5/20=r/9 equation: 


r in (-oo:+oo)

5/20 = r/9 // - r/9

5/20-(r/9) = 0

1/4-1/9*r = 0 // - 1/4

-1/9*r = -1/4 // : -1/9

r = -1/4/(-1/9)

r = 9/4

r = 9/4

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