A useful and easily accessible high level math problem solving resource is Mathway.com. The site has a variety of different tools that can help solve linear, polynomial and quadratic algebraic equations and expressions. However, this is not all Mathway.com has to offer.
Mathway.com also offers tools that can solve problems from basic math all the way up to calculus. The site includes a section with tools for solving problems in chemistry.
Another online math resource that can help students solve algebra problems is WolphramAlpha.com. This site offers similar tools that can help ease any troubles that students come across in the field of mathematics.