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u in (-oo:+oo)
u/7 < 5 // - 5
u/7-5 < 0
1/7*u-5 < 0 // + 5
1/7*u < 5 // : 1/7
u < 5/1/7
u < 35
u in (-oo:35)
(-oo:35)
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