/ ____________ \ | / ____ | | / \/ 78 1 | And|7 + 3 / 1 + ------ + ------------------- <= x, x < oo| | \/ 9 ____________ | | / ____ | | / \/ 78 | | 3*3 / 1 + ------ | \ \/ 9 /
(x < oo)∧(7 + (1 + sqrt(78)/9)^(1/3) + 1/(3*(1 + sqrt(78)/9)^(1/3)) <= x)
____________ 3 ___ 3 / ____ 2/3 \/ 3 *\/ 9 + \/ 78 3 [7 + --------------------- + -----------------, oo) 3 ____________ 3 / ____ 3*\/ 9 + \/ 78
x in Interval(3^(2/3)/(3*(sqrt(78) + 9)^(1/3)) + 3^(1/3)*(sqrt(78) + 9)^(1/3)/3 + 7, oo)