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X in (-oo:+oo)
X/4-9 < -8 // + 8
X/4-9+8 < 0
1/4*X-1 < 0 // + 1
1/4*X < 1 // : 1/4
X < 1/1/4
X < 4
X in (-oo:4)
(-oo:4)
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