Another one about optimization

I do need help doing this damn assignment. I have the program already finished, but it doesn't deliver a nice optimization. For this:

2(b * lna * lnk * k^(bx) * a^(k^(bx)) * (a^(k^(bx)) - d) - c + x)

How do I get a nice approximation of that to zero? x is the only variable.

http://i.imgur.com/7Ui1NzT.png

and here he is: http://www.gravatar.com/avatar/d787caaf04b85641692a24099fcee990?s=128&d=identicon&r=PG

Typical kikes and 1/2 kikes have sloped skull (easy to see due to early loss of hair due to genetic disorders), curly nigger-like hair, prognathism (big lower jaw, protruding forward), darkened skin (due to nigger ancestry), almond-shaped brown eyes (or just big eyes), enormous distance between eyes, puffy nigger lips, ingrown earlobes, acute ears (growing at significant angle), different nipples form and color. Jewish smile exposes gums, making Jew even uglier. Some kikes also have this specific Jewish stench.