Question 324390
{{{(z - 4)/(z - 3) = (z + 2)/(z + 1)}}}
Multiply both sides by {{{(z-3)(z+1)}}}
{{{(z+1)(z-4)=(z-3)(z+2)}}}
{{{z^2-4z+z-4=z^2+2z-3z-6}}}
{{{z^2-3z-4=z^2-z-6}}}
{{{-2z=-2}}}
{{{highlight(z=1)}}}