Question 726799
 {{{((6x^2-6)/(8x^2+8x))/((3-3x)/(4x^2+4x))}}}
 {{{(4/3)*(3/4)*((x^2-1)/(x^2+x))/((1-x)/(x^2+x))}}}
 {{{((x^2-1)/(x^2+x))*((x^2 + x)/(1-x))}}}
{{{ ( x^2 - 1 ) / ( 1 - x ) }}}
{{{ ( ( x+1)*(x-1) ) / ( -(x-1)) }}}
{{{ -(x+1) }}}
quick check:
I'll say {{{ x = 5 }}}
 {{{((6x^2-6)/(8x^2+8x))/((3-3x)/(4x^2+4x))}}}
 {{{((6*5^2-6)/(8*5^2+8*5))/((3-3*5)/(4*5^2+4*5))}}}
 {{{(( 144)/(240))/((-12)/(120))}}}
{{{ ( 3/5 ) / ( -1/10 )  = -6 }}}
and
{{{ -(x+1)  = -( 5+1 ) }}}
{{{ -(x+1) = -6 }}}
OK