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x in (-oo:+oo)
7-((2/3)*x) < x-7 // - x-7
7-((2/3)*x)-x+7 < 0
(-2/3)*x-x+7+7 < 0
14-5/3*x < 0 // - 14
-5/3*x < -14 // : -5/3
x > -14/(-5/3)
x > 42/5
x in (42/5:+oo)
(42/5:+oo)
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