This calculator will take an expression without parentheses and combine like terms.
Shortcut commands are included, simply enter the expression you wish to have like terms combined into the search engine such as 4x^2+9x+3x^2-6+9-8x. Multi-Variable expressions such as 5y - 9x + 6y + 3x - 7 - 8 are alllowed as well. It does not handle expressions with double variables in one term yet such as 5x^2y^3, but I may build this in the future.
Like Terms calculator