[RESOLVED] Math, solve for $x - I was a poor student

[kender]

Okay, I need to find a variable $x, when given what it equals in a math problem

$y = '.3334';
1000 = $x + ($x * $y);

Anyone know enough math, and PHP to get me out of this problem? I need to find a way to turn it into an
$x = ...

[kender]

$x = 1000/(1 + $y);