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s in (-oo:+oo)
s/5 > 1.4 // - 1.4
s/5-1.4 > 0
1/5*s-1.4 > 0 // + 1.4
1/5*s > 1.4 // : 1/5
s > 1.4/1/5
s > 7
s in (7:+oo)
(7:+oo)
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