/ 2*x \ lim log|-x + ------| x->4+ \ -4 + x/
Limit(log(-x + (2*x)/(-4 + x)), x, 4)
/ 2*x \ lim log|-x + ------| x->4+ \ -4 + x/
oo
= 7.09505888596479
/ 2*x \ lim log|-x + ------| x->4- \ -4 + x/
oo
= (10.9260386126816 + 3.14159265358979j)
= (10.9260386126816 + 3.14159265358979j)