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x in (-oo:+oo)
(2/3)*x-10 < 1/3 // - 1/3
(2/3)*x-(1/3)-10 < 0
(2/3)*x-1/3-10 < 0
2/3*x-31/3 < 0 // + 31/3
2/3*x < 31/3 // : 2/3
x < 31/3/2/3
x < 31/2
x in (-oo:31/2)
(-oo:31/2)
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