A very simple and useful calculator!

You can do some mathematical actions with this, f.e. +,-,*,/.
Please, write your mathematical expressions
f.e. (26374+4673)*364-263/363*(273*34+36)+263/23
then click calculate button and the result you can get in the textarea.
This calculator gives us opportunity to enter some variables. Try this one:
x=2, y=3454, z=8675866,
(23*x-56)/y+x*z-3434
It's possible to change the value of the variables without doing anything with expression.