I'm back

Alright, the answer should be -126 and 124. I am able to get 124 but not -126. Here is what I'm doing:

$\displaystyle (3-(x+1)^{2/3})/2 = -11$

$\displaystyle 3-(x+1)^{2/3} = -22$

$\displaystyle -(x+1)^2/3 = -25$

$\displaystyle (x+1)^{2/3} = 25$

$\displaystyle x+1 = 125$

$\displaystyle x = 124$

I'm only getting one answer. Where is the -126 coming from?