how do i simplify

Simplify the following:
2+5 i-(9 i-4)

-(-4+9 i) = 4-9 i:
4-9 i+2+5 i

4-9 i+2+5 i = (4+2)+(-9 i+5 i) = 6-4 i:
6-4 i

Factor 2 out of 6-4 i giving 2 (3-2 i):
Answer: 2(3 - 2i)