Question 990944
 (1/x) + (1/x+2) = (1/3) 
(x+2+x) / (x*(x+2)) = (1/3)
(2x+2) / (x^2+2x) = (1/3)
cross multiply the fractions
3*(2x+2) = x^2 + 2x
6x+6 = x^2 + 2x
x^2 - 4x - 6 = 0
use quadratic equation
x = (4 + square root(16-4*(-6))) / 2 = (4+2sqrt(10))/2 = 2+sqrt(10)
x = (4 - square root(16-4*(-6))) / 2 = (4-2sqrt(10))/2 = 2-sqrt(10)