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X in (-oo:+oo)
X/3.5 > 6 // - 6
X/3.5-6 > 0
0.28571429*X-6 > 0 // + 6
0.28571429*X > 6 // : 0.28571429
X > 6/0.28571429
X > 20.99999969
X in (20.99999969:+oo)
(20.99999969:+oo)
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