Question 943485
{{{1/(x+3)+1/(x-3)=(x-3)/((x+3)(x-3))+(x+3)/((x+3)(x-3))=((x-3)+(x+3))/((x+3)(x-3))=(x-3+x+3)/((x+3)(x-3))=highlight(2x/((x+3)(x-3))=2x/(x^2-9))}}}