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x in (-oo:+oo)
(2/3)*x-20 > -6 // + 6
(2/3)*x-20+6 > 0
2/3*x-14 > 0 // + 14
2/3*x > 14 // : 2/3
x > 14/2/3
x > 21
x in (21:+oo)
(21:+oo)
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