_______ _______ _______ \/ x + 5 + \/ x - 3 >= \/ x + 7
sqrt(x - 3) + sqrt(x + 5) >= sqrt(x + 7)
/ ____ \ | 4*\/ 21 | And|-3 + -------- <= x, x < oo| \ 3 /
(x < oo)∧(-3 + 4*sqrt(21)/3 <= x)
____ 4*\/ 21 [-3 + --------, oo) 3
x in Interval(-3 + 4*sqrt(21)/3, oo)