X^2/(x- 9 = 81/(x - 9) This is the equation for which you want the solution. Multiplying both sides of the equation by (x - 9) we get x^2(x - 9)/(x - 9) = 81(x - 9)/(x - 9) So the (x - 9) goes out from both the denominator and the numerator and then the simplified equation becomes x^2 = 81 x ^2 = (9)^2 x = 9 So the value of the unknown variable x comes out to be 9.
