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x in (-oo:+oo)
4 < (4/7)*x // - (4/7)*x
4-((4/7)*x) < 0
(-4/7)*x+4 < 0
4-4/7*x < 0 // - 4
-4/7*x < -4 // : -4/7
x > -4/(-4/7)
x > 7
x in (7:+oo)
(7:+oo)
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