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x in (-oo:+oo)
3-(x/4) < 2*x-(6/13) // - 2*x-(6/13)
6/13-(x/4)-(2*x)+3 < 0
6/13-(x/4)-2*x+3 < 0
45/13-9/4*x < 0 // - 45/13
-9/4*x < -45/13 // : -9/4
x > -45/13/(-9/4)
x > 20/13
x in (20/13:+oo)
(20/13:+oo)
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