Question 509154
Sorry for misunderstanding your question last time:

So we have:

{{{expr(9/(((x+1)/(x-1)) -1))}}}

Get a common denominator of x-1:

{{{expr(9/(((x+1)/(x-1)) -(x-1)/(x-1)))}}}

Simplify the numerator(that is in the denominator)

{{{expr(9/(2/(x-1)))}}}

Use the definition of division:

{{{expr(9 * ((x-1)/2))}}}

Simplify

{{{expr((9 *(x-1))/2)}}} <--- Answer