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x in (-oo:+oo)
x/3-2 < 4 // - 4
x/3-4-2 < 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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