Question

i have a little question;
when i using idle how use unknown quantity

ex) 54x-24x enter -> define error X

Answer 1

x needs to have a value before it can be read. It would need to be read to multiply it by 54 or 24. You could write something like:

x = 1
y = 54 * x - 24 * x
# a better way to write it
# y = ( 54 * x ) - ( 24 * x )

Answer 2

or even http://pastie.org/7362916