_________ x + 1 \/ 5*x + 4 < ------- _____ \/ 3*x
sqrt(5*x + 4) < (x + 1)/sqrt(3*x)
/ ____\ | 5 \/ 39 | And|0 < x, x < - -- + ------| \ 14 14 /
(0 < x)∧(x < -5/14 + sqrt(39)/14)
____ 5 \/ 39 (0, - -- + ------) 14 14
x in Interval.open(0, -5/14 + sqrt(39)/14)