The webmaster has quite a few solvers, if you only need to check that you have the correct answer. You have to go through the lessons in order, but the coverage is quite nice, so the review won't hurt. This site has lessons on basic algebra topics and techniques, study tips, calculator advice, and more. Algebra Online Read the terms and conditions regarding the use of this free and generally fast tutoring service, and then sign up. The demo version is severely truncated.
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Response was same-day when I tested the service, and the replies were very friendly and supportive. This school has a lengthy list of algebra lessons. You can follow their lesson map, or else find what you want in their index. They cover only a few topics, but the coverage is excellent, and extends from algebra to trigonometry and set theory. This program is shareware so, if you plan to use it long-term, be sure to return to the site and pay for it.