NO....
Yes. If equals are added to equals, then the results of the additions are equal.
When equals are added to equals, you don't necessarily get wholes. But whatever you do get, they're equal.
Yes they are.
50
23
-2 and -4 do that.
The numbers are 6 and -20
Any number added to its negative equals zero.
Equals to? When added to what?
-53
negative
140