Question 878197
{{{y1=1/x}}}
{{{y2=1/(2x)}}}
{{{y3=1/(x-9)}}}
{{{8*y1+2*y2=y3}}}
{{{8/x+2/(2x)=1/(x-9)}}}
{{{8/x+1/x=1/(x-9)}}}
{{{9/x=1/(x-9)}}}
{{{9(x-9)=x}}}
{{{9x-81=x}}}
{{{8x=81}}}
{{{x=81/8}}}