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u in (-oo:+oo)
u/18 = 25/90 // - 25/90
u/18-(25/90) = 0
u/18-5/18 = 0
1/18*u-5/18 = 0 // + 5/18
1/18*u = 5/18 // : 1/18
u = 5/18/1/18
u = 5
u = 5
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