PEMDAS is typcially expanded into the phrase, "Please Excuse My Dear Aunt Sally.
How Wolfram Alpha solves equations For equation solving, Wolfram Alpha calls the Wolfram Language's Solve and Reduce functions, which contain a broad range of methods for all kinds of algebra, from basic linear and quadratic equations to multivariate nonlinear systems.
Microsoft Math instantly recognizes the problem and helps you to solve it with step-by-step explanation, interactive graphs, similar problems from the web and online video lectures.