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x in (-oo:+oo)
(2/7)*x < -14 // + 14
(2/7)*x+14 < 0
2/7*x+14 < 0 // - 14
2/7*x < -14 // : 2/7
x < -14/2/7
x < -49
x in (-oo:-49)
(-oo:-49)
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