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r in (-oo:+oo)
r/9 = 5/20 // - 5/20
r/9-(5/20) = 0
r/9-1/4 = 0
1/9*r-1/4 = 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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