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x in (-oo:+oo)
1/3-((5/2)*x) < 2/7-x // - 2/7-x
x-((5/2)*x)+1/3-(2/7) < 0
(-5/2)*x+x+1/3-2/7 < 0
1/21-3/2*x < 0 // - 1/21
-3/2*x < -1/21 // : -3/2
x > -1/21/(-3/2)
x > 2/63
x in (2/63:+oo)
(2/63:+oo)
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