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x in (-oo:+oo)
20 < x/13 // - x/13
20-(x/13) < 0
20-1/13*x < 0 // - 20
-1/13*x < -20 // : -1/13
x > -20/(-1/13)
x > 260
x in (260:+oo)
(260:+oo)
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