Question 349156
HI,
If I am understanding your question properly
.
{{{(1-y)/(1+y) = ( 2/3)}}}
.
Solve by cross multiplying
{{{3*(1-y)= 2*(1+y) }}}
.
Simplify and Solve:
{{{3-3*y) = 2+ 2*y) }}}
.
{{{3-3*y) = 2 + 2*y)}}}
.
{{{1 =5*y)}}}
{{{(1/5) = y)}}}
{{{y =highlight(1/5)}}}
. 
check your answer by substituting x= 1/5 into the original equation
{{{(4/5)/(6/5) = (4/6) = (2/3)}}}