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x in (-oo:+oo)
x/(-4) < 5/6 // - 5/6
x/(-4)-(5/6) < 0
x/(-4)-5/6 < 0
-1/4*x-5/6 < 0 // + 5/6
-1/4*x < 5/6 // : -1/4
x > 5/6/(-1/4)
x > -10/3
x in (-10/3:+oo)
(-10/3:+oo)
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