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X in (-oo:+oo)
X/10 > -9 // + 9
X/10+9 > 0
1/10*X+9 > 0 // - 9
1/10*X > -9 // : 1/10
X > -9/1/10
X > -90
X in (-90:+oo)
(-90:+oo)
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