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The X and Y you need to put a number in X and Y
   3 + 1 = 4
   4 + 2 = 6

The X,Y, is a blank number
any letter , don't worry
if it is E + G that is blank number again
1 5 1
It is very simple X+Y = Y+X because you can not add unlike terms unless this variables has correspondent number for example :
X= 2
Y= 3
then X+Y=
hope that helps 
and also X+Y is not equals XY many people always get confuse and will answer XY and that's wrong because XY is basically saying X times Y and X times Y is not the same as X+Y 
0 0 0
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