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