Question 890822
This is the text to use:
z/(z+5)=(4z)/(6z-4)


{{{z/(z+5)=(4z)/(6z-4)}}}
Do not immediately divide by z both sides because you risk loosing a solution.
{{{z(6z-4)=4z(z+5)}}}
{{{6z^2-4z=4z^2+20z}}}
{{{2z^2-4z=20z}}}
{{{z^2-2z=10z}}}
{{{z^2-12z=0}}}
{{{highlight_green(z(z-12)=0)}}} and use zero-product rule.