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x in (-oo:+oo)
-17 > x/3-19 // - x/3-19
19-(x/3)-17 > 0
2-1/3*x > 0 // - 2
-1/3*x > -2 // : -1/3
x < -2/(-1/3)
x < 6
x in (-oo:6)
(-oo:6)
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