Where I can find a free online algebra solver?

WolframAlpha is an online program that can process algebraic and other mathematical problems. It is a self-dubbed "computational knowledge engine" that aims to collect the world's data into a form that can be processed and computed.

WolframAlpha can take any algebraic equation with one or more unknown variables and process it. Users need only input the formula; they do not need to download special software. Aside from answers to equations, the site also plots the equation on a graph. Users who pay for a subscription can get access to step-by-step solutions and an algebraic problem generator to help increase their proficiency in algebra.