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u in (-oo:+oo)
7*u = 14/15 // - 14/15
7*u-(14/15) = 0
7*u-14/15 = 0
7*u-14/15 = 0 // + 14/15
7*u = 14/15 // : 7
u = 14/15/7
u = 2/15
u = 2/15
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