# basic algebra with several variables-why won't it work?

Hi,

I'm trying to use Sage-Notebook as a basic calculator and want to do some basic algebra for two variables. However, it keeps giving me syntax error messages when I type in the below. What am I doing wrong?

x, y = var('x, y')
solve([20*(6400-x-2y)==0, 80*(3200-x-y)==0], x, y)

Traceback (click to the left of this block for traceback) ... SyntaxError: invalid syntax

Thank you!