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u in (-oo:+oo)
10 < (-8/5)*u // - (-8/5)*u
10-((-8/5)*u) < 0
(8/5)*u+10 < 0
8/5*u+10 < 0 // - 10
8/5*u < -10 // : 8/5
u < -10/8/5
u < -25/4
u in (-oo:-25/4)
(-oo:-25/4)
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