Question 229239
COMPLETE
4X/X-1=?/(X+1)(X-1)
:
Use z instead of ?
{{{(4x)/((x-1))}}} = {{{z/((x+1)(x-1))}}}
:
Multiply both sides by (x+1)(x-1), results
:
4x(x+1) = z
:
Replace z:
{{{(4x)/((x-1))}}} = {{{(4x(x+1))/((x+1)(x-1))}}}
:
Note if cancel (x+1), you have
{{{(4x)/((x-1))}}} = {{{(4x)/((x-1))}}}; obviously true