/-12 + 4*x\ lim |---------| x->3+\ |-3 + x|/
Limit((-12 + 4*x)/|-3 + x|, x, 3)
4
= 4
/-12 + 4*x\ lim |---------| x->3-\ |-3 + x|/
-4
= -4
4.0