At the risk of beating a dead horse I will rephrase Isa 45:7 I form the light, and create darkness: I make peace, and create evil: I the LORD do all these [things] in a way that might make it more clear
When I create light, I create darkness and when I create peace I create evil: etc. This was demonstrated in Genesis --->
Gen 1:3 And God said, Let there be light: and there was light.
Gen 1:4 And God saw the light, that [it was] good: and God divided the light from the darkness.
The Hebrew word translated as divided has this definition according to the Blue letter Bible (www.blueletterbible.org)
1) to divide, separate
a) (Hiphil)
1) to divide, separate, sever
2) to separate, set apart
3) to make a distinction, difference
4) to divide into parts