Resolva as inequações:
a) 2x – 6 > 0
b) -4x + 2 < 0
c) (4x + 4).(-2x + 4) >0
d) x2 – 8x + 12 > 0
e) x2 – 6x + 9 < 0
f) (x2 – 9).(x2 – 4x) < 0