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X in (-oo:+oo)
X/4 < 9 // - 9
X/4-9 < 0
1/4*X-9 < 0 // + 9
1/4*X < 9 // : 1/4
X < 9/1/4
X < 36
X in (-oo:36)
(-oo:36)
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