3·√(x + 2) - 2·√(x - 13) = 5·√(x - 10)
9·(x + 2) - 12·√(x + 2)·√(x - 13) + 4·(x - 13) = 25·(x - 10)
12·√(x + 2)·√(x - 13) = 9·(x + 2) + 4·(x - 13) - 25·(x - 10)
12·√(x + 2)·√(x - 13) = 216 - 12·x
√(x + 2)·√(x - 13) = 18 - x
(x + 2)·(x - 13) = x^2 - 36·x + 324
x^2 - 11·x - 26 = x^2 - 36·x + 324
25·x = 350 x = 14