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u in (-oo:+oo)
u/4 = 17/13 // - 17/13
u/4-(17/13) = 0
u/4-17/13 = 0
1/4*u-17/13 = 0 // + 17/13
1/4*u = 17/13 // : 1/4
u = 17/13/1/4
u = 68/13
u = 68/13
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