>>14419158Assuming not bait, they're trying to get you to do this:
The following 5 lines are all equivalent forms.
1. (a+b)+(c+d)
2. (a+(b+c))+d by associativity
3. ((b+c)+a)+d by commutativity
4. (b+c)+(a+d) by associativity
5. (a+d)+(b+c) by commutativity
