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x in (-oo:+oo)
6 > (2/3)*x // - (2/3)*x
6-((2/3)*x) > 0
(-2/3)*x+6 > 0
6-2/3*x > 0 // - 6
-2/3*x > -6 // : -2/3
x < -6/(-2/3)
x < 9
x in (-oo:9)
(-oo:9)
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