_________ \/ 8*x - 1 < 7*x - 11
sqrt(8*x - 1) < 7*x - 11
/ _____ \ | 81 \/ 583 | And|x < oo, -- + ------- < x| \ 49 49 /
(x < oo)∧(81/49 + sqrt(583)/49 < x)
_____ 81 \/ 583 (-- + -------, oo) 49 49
x in Interval.open(sqrt(583)/49 + 81/49, oo)