Simplify
-i-2-(6-4i)-(5-2i)
treat these just like any other binomial, keeping reals and imaginaries separate:
-i-2-(6-4i)-(5-2i)
-i-2-6+4i-5+2i
(-2-6-5)+(-1+4+2)i
-13+5i
-i-2-(6-4i)-(5-2i)
-i-2-(6-4i)-(5-2i)
-i-2-6+4i-5+2i
(-2-6-5)+(-1+4+2)i
-13+5i