[RESOLVED] MATH: Solve for $x - I was a poor student

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

PHP Code:

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$y = '.3334';
1000 = $x + ($x * $y); 


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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 = ...

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