I have used it through many math classes Algebra 2 College Algebra and Algebra 1. X2 4x 5 0. By simply typing in a problem homework a step by step solution would appear by a click on Solve.
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In general you solve for a variable by moving all the terms with the variable to one side of the equation and all the other terms to the other side. Solve in one variable or many. For example the equation 5 a 15. Hence it is a permutation problem.