Question 368281
{{{3(x^2+5x) = 1/81}}}
{{{243(x^2+5x) = 1}}}
{{{243x^2+1215x-1=0}}}
Use the quadratic formula,
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{x = (-1215 +- sqrt( 1215^2-4*243*(-1) ))/(2*243) }}} 
{{{x = (-1215 +- sqrt( 1476225+972 ))/(486) }}}
{{{x = (-1215 +- sqrt( 1477197 ))/(486) }}}
{{{x = (-1215 +- 9*sqrt(18237  ))/(486) }}}
{{{highlight(x = (-135 +- sqrt(18237  ))/(54)) }}}