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x in (-oo:+oo)
(2*x)/7 < -4 // + 4
(2*x)/7+4 < 0
2/7*x+4 < 0 // - 4
2/7*x < -4 // : 2/7
x < -4/2/7
x < -14
x in (-oo:-14)
(-oo:-14)
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