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u in (-oo:+oo)
5 < (-3/2)*u-7 // - (-3/2)*u-7
5-((-3/2)*u)+7 < 0
(3/2)*u+5+7 < 0
3/2*u+12 < 0 // - 12
3/2*u < -12 // : 3/2
u < -12/3/2
u < -8
u in (-oo:-8)
(-oo:-8)
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