Question 486723
{{{(u+5)/(u+4)=(u+4)/(u+6)+1}}}
{{{(u+5)/(u+4)=(u+4+u+6)/(u+6)}}}
{{{(u+5)/(u+4)=(2u+10)/(u+6)}}}
{{{(u+5)(u+6)=(2u+10)(u+4)}}}
{{{u^2+6u+5u+30=2u^2+8u+10u+40}}}
{{{u^2+11u+30-2u^2-18u-40=0}}}
{{{-u^2-7u-10=0}}}
{{{u^2+7u+10=0}}}
{{{(u+2)(u+5)=0}}}
{{{u+2=0}}} or {{{u+5=0}}}
{{{u[1]=-2}}} or {{{u[2]=-5}}}