Question 736438
{{{
x/(x+3) + 3/(x-3) = 4
}}}


{{{
(x(x-3))/((x+3)(x-3)) + (3(x+3))/((x+3)(x-3)) = (4(x+3)(x-3))/((x+3)(x-3))
}}}


leads to...

{{{x^2-3x+3x+9 = 4(x^2-9)
}}}


and then


{{{3x^2-45=0}}}


{{{x=sqrt(15)}}}

or 

{{{x=-sqrt(15)}}}