Question 8437
{{{(10x^2 - 30x + 20) /( x^2 - 1)}}}
{{{10(x^2 - 3x + 2) /( x-1)(x+1)}}}
{{{10(x-2)(x-1) /( x-1)(x+1)}}}                        <--(x-1) cancels out
{{{10(x-2)/(x+1)}}}


{{{(10x-20)/(x+1)}}}