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x in (-oo:+oo)
(2*x)/3 > 7 // - 7
(2*x)/3-7 > 0
2/3*x-7 > 0 // + 7
2/3*x > 7 // : 2/3
x > 7/2/3
x > 21/2
x in (21/2:+oo)
(21/2:+oo)
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