Given [1 / (x + 4)] + 1/2 = 1 / (x + 4)
(2 + x + 4) / 2(x + 4) = 1 / (x + 4)
(x + 6) / (2x + 8) = 1 / (x + 4)
(x + 6)(x + 4) = 2x + 8
x^2 + 10x + 24 = 2x + 8
x^2 + 8x + 16 = 0
(x + 4)^2 = 0
x = -4, -4
-4, non extraneous
Math Question Help - http://math.tutorvista.com/math-questions.html