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