Question 154359
This is actually an equation (since it has an equals sign).



{{{2/z=8/z-1/5}}} Start with the given equation.



{{{5cross(z)(2/cross(z))=5z(8/cross(z)-1/cross(5))}}} Multiply both sides by {{{5z}}} to eliminate the fractions.



{{{10=40-z}}} Simplify



{{{10-40=-z}}} Subtract 40 from both sides.



{{{-30=-z}}} Subtract.



{{{30=z}}} Multiply both sides by -1 to isolate "z".



So the solution is {{{z=30}}}