As I browse through the “blogosphere” (weird, the first time that I used this term) I came across something really interesting. MSN search (beta) can solve your algebra problems, at least some of them:
Goto MSN search (beta) and enter something like x^2+x^3=36 and see the result:
Groovy! It seems though that more complex problems are not solved via this search engine – I guess no problem as you wouldn’t expect that your search engine can solve any mathematical problems in the first place.