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x in (-oo:+oo)
(2/3)*x-x > 6 // - 6
(2/3)*x-x-6 > 0
-1/3*x-6 > 0 // + 6
-1/3*x > 6 // : -1/3
x < 6/(-1/3)
x < -18
x in (-oo:-18)
(-oo:-18)
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