Question 302223
Simplify (2y^-2+y^-1)/(2y^-2-y^-1)

{{{((2/(y^2))+(1/y)) }}} ÷ {{{((2/(y^2))-(1/y)) }}}

Common denominator = y^2

This gives: 
{{{((2+y)/(y^2))) }}}* {{{((y^2)/(2-y))) }}}

cancel out "y^2" 

{{{((2+y)/(2-y))) }}}