Question 882628
{{{-2/z+1/(4z)=7/(z+10)}}}
Multiply both sides by {{{4z(z+10)}}}
{{{-8(z+10)+(z+10)=28z}}}
{{{-8z-80+z+10=28z}}}
{{{-7z-70=28z}}}
{{{-35z=70}}}
{{{z=-2}}}