(one - (x + one)/(x - one))*(one /(x + one) + one /(x - one))/(x + one) = zero
(1 minus (x plus 1) divide by (x minus 1)) multiply by (1 divide by (x plus 1) plus 1 divide by (x minus 1)) divide by (x plus 1) equally 0
(one minus (x plus one) divide by (x minus one)) multiply by (one divide by (x plus one) plus one divide by (x minus one)) divide by (x plus one) equally zero