How Does This Algebraic Equation Simplify to This Result?

[literacola]

Homework Statement

Was just wondering how this equation:

$$(k*16*10^(-6))/d^2=(k*16e-6)/(30-d)^2$$

gets manipulated to produce this result

$$20(3-d)^2=d^2$$

$$d=2$$

Homework Equations

The Attempt at a Solution

I've tried manipulating it myself but it ends up with me spiraling off into pages of crap that is obviously wrong.

 

[jdc15]

Are you sure you typed that in right?

Were you trying to say this?:
(k*16*10^-6)/d² = (k*16*10^-6)/(30-d)²

If so, then first you would cancel the k expressions at the top, reciprocal both sides, expand and solve for d. However, I get a different result than what you give below.