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x in (-oo:+oo)
(2/3)*(12-x) > 4 // - 4
(2/3)*(12-x)-4 > 0
2/3*(12-x)-4 > 0
2/3*(12-x)-4 > 0
4-2/3*x > 0
4-2/3*x > 0
4-2/3*x > 0 // - 4
-2/3*x > -4 // : -2/3
x < -4/(-2/3)
x < 6
(-oo:6) (6:+oo) 4-2/3*x + -
x in (-oo:6)
(-oo:6)
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