If you did copy paste of the equation from some other place into "Alebrator", it is most likely that you will get "Your expression is incomplete" message.

You need to type the expression manually, and to do it correctly, please check the "Math expression entry" located here.

To see the solution of the expression you were trying to solve, click here.

You can obtain an explanation for any step by clicking on it. Please note that you cannot click on the very first expression, which is the original problem.