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u in (-oo:+oo)
u/4-15 > 23 // - 23
u/4-23-15 > 0
1/4*u-38 > 0 // + 38
1/4*u > 38 // : 1/4
u > 38/1/4
u > 152
u in (152:+oo)
(152:+oo)
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