Question 1030081
{{{3/x+x/3-b=0}}}------FIRST STEP


{{{3x(3/x)+3x(x/3)-3x*b=3x*0}}}------simplest common denominator is 3x.


{{{9+x^2-3bx=0}}}


{{{x^2-3bx+9=0}}}


Discriminant must be equal to 0 for the equation to have ONE only solution.
{{{(3b)^2-4*9=0}}}, the discriminant equated to 0.
{{{9b^2-4*9=0}}}
{{{9b^2=4*9}}}
{{{highlight(b=0+- 2)}}}