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u in (-oo:+oo)
8-((1/7)*u) > 5 // - 5
8-((1/7)*u)-5 > 0
(-1/7)*u-5+8 > 0
3-1/7*u > 0 // - 3
-1/7*u > -3 // : -1/7
u < -3/(-1/7)
u < 21
u in (-oo:21)
(-oo:21)
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