Algebra Simplification

Hi All,
[tex] y + 4 = \frac{x}{2} [\MATH] Solve for y.

[tex] y = \frac{x}{2} - \frac{4}{1} [\MATH] = [tex] \frac{x - 4}{2} [\MATH]

However the answer is [tex] y = \frac{x-8}{2} [\MATH]

Where did I go wrong?

Thanks,
D

As an offthread - is there isssues with Latex? If I change the '\' to '/' on the terminating MATH, I get latex compile errors. I get it on every computer. see below

"Where did I go wrong?" Here: http://latex.codecogs.com/png.latex?y= \frac{x - 4}{2}

The fractions don't have the same numitor, you can't add them that way.

http://latex.codecogs.com/png.latex?...=\frac{x-8}{2} The answer ^^