Question 779618
{{{ x = 3*( 1 - e^(-2y) ) }}}
{{{ x/3 = 1 - e^(-2y) }}}
{{{ - e^(-2y) = x/3 - 1 }}}
{{{ e^(-2y) = 1 - x/3 }}}
{{{ e^(-2y) = ( 3-x )/3 }}}
Take the natural log of both sides
{{{ -2y = ln( 3-x ) - ln(3) }}}
{{{ y = (1/2)*ln(3) - (1/2)*ln( 3-x ) }}}