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X in (-oo:+oo)
X/7 > -8 // + 8
X/7+8 > 0
1/7*X+8 > 0 // - 8
1/7*X > -8 // : 1/7
X > -8/1/7
X > -56
X in (-56:+oo)
(-56:+oo)
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