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u in (-oo:+oo)
u/4 = 5/30 // - 5/30
u/4-(5/30) = 0
u/4-1/6 = 0
1/4*u-1/6 = 0 // + 1/6
1/4*u = 1/6 // : 1/4
u = 1/6/1/4
u = 2/3
u = 2/3
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