simplify (x^3-x)/x
Let's reduce: x3 -xx
We first try to factorize the numerator
Let's factor in : x3 -x
You can factorize this expression into: x·(x2 -1)
Let's factor in : (x2 -1)
Factors found: (x + 1)·(x -1)
With the new factorized numerator, we try to simplify the new quotient: x·(x + 1)·(x -1)x
(x + 1)·(x -1)
x·x + x·-1 + 1·x + 1·-1
x2 -x + x -1
x2 + 0 -1
Answer:   x2 -1