Make me up some unsolved math expressions!

I am currently making a calculator program that will simplify expressions (with variables). However, I need people to give me some math expressions (unsolved) to test it with. For example:

-5 * 10(3 + x)

I need things like this. Anything you can think of. I'm just testing right now to make sure my program won't crash when it reads the expression; it doesn't solve them quite yet.

So just make up numbers and put them in an expression! Use may multiplication(*), division(/), addition(+), subtraction(-), and/or exponents(^). Along with negative numbers, variables, and/or parenthesis. You DON'T even have to solve them. Just make painful, reasonably sized expressions and post them here!

A few more examples:

5 + 2 * (1000/750 + 2x)

((5 + 4) * 7) - 4

9 * 10 - (14/2) * (7+4)

(17-18+4)9-2

71/2(1/4*16)

12.5x/7 - (512 - 413)

842/48*32(6-7+1)

17x*9/4-18

(42*42)x/888-222

*=Divide

3700*26x(5+78)-6=?

3x78.9-92.689+(304-56^.2169) x 47
_______________________________(<~ all divided by)
49216342-3849.2047^2.9 +1

^u^