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X in (-oo:+oo)
X/2 < -18 // + 18
X/2+18 < 0
1/2*X+18 < 0 // - 18
1/2*X < -18 // : 1/2
X < -18/1/2
X < -36
X in (-oo:-36)
(-oo:-36)
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