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x in (-oo:+oo)
(1/4)*x > x/3-6 // - x/3-6
(1/4)*x-(x/3)+6 > 0
6-1/12*x > 0 // - 6
-1/12*x > -6 // : -1/12
x < -6/(-1/12)
x < 72
x in (-oo:72)
(-oo:72)
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