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x in (-oo:+oo)
7-((4/5)*x) < 3/5 // - 3/5
7-((4/5)*x)-(3/5) < 0
(-4/5)*x-3/5+7 < 0
32/5-4/5*x < 0 // - 32/5
-4/5*x < -32/5 // : -4/5
x > -32/5/(-4/5)
x > 8
x in (8:+oo)
(8:+oo)
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