Question 911948
Dividing by a fraction is equivalent to multiplying by its reciprocal,
{{{((5z+20)/2)/((z+4)/z)=((5z+20)/2)*(z/(z+4))}}}
{{{((5z+20)/2)/((z+4)/z)=((5(z+4))/2)*(z/(z+4))}}}
{{{((5z+20)/2)/((z+4)/z)=(5/2)z}}}