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u in (-oo:+oo)
u/7 > 10 // - 10
u/7-10 > 0
1/7*u-10 > 0 // + 10
1/7*u > 10 // : 1/7
u > 10/1/7
u > 70
u in (70:+oo)
(70:+oo)
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