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x in (-oo:+oo)
(2*x)/7-(6*x) > -2 // + 2
(2*x)/7-(6*x)+2 > 0
(2*x)/7-6*x+2 > 0
2-40/7*x > 0 // - 2
-40/7*x > -2 // : -40/7
x < -2/(-40/7)
x < 7/20
x in (-oo:7/20)
(-oo:7/20)
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