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X in (-oo:+oo)
X/5-2 < -6 // + 6
X/5-2+6 < 0
1/5*X+4 < 0 // - 4
1/5*X < -4 // : 1/5
X < -4/1/5
X < -20
X in (-oo:-20)
(-oo:-20)
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