/ 2 \ |x - 3*x| lim |--------| x->3+\-9 + 3*x/
Limit((x^2 - 3*x)/(-9 + 3*x), x, 3)
= 1
1
/ 2 \ |x - 3*x| lim |--------| x->3-\-9 + 3*x/
1.0