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X in (-oo:+oo)
(1/3)*(X-6) < 2 // - 2
(1/3)*(X-6)-2 < 0
1/3*(X-6)-2 < 0
1/3*(X-6)-2 < 0
1/3*X-4 < 0
1/3*X-4 < 0
1/3*X-4 < 0 // + 4
1/3*X < 4 // : 1/3
X < 4/1/3
X < 12
(-oo:12) (12:+oo) 1/3*X-4 - +
X in (-oo:12)
(-oo:12)
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