Answer:
1. x+y = -2/3 + 1/3 = -1/3
y+x = 1/3 + -2/3 = -1/3
x+y = y+x
2. x+y = 4/5 + -7/2 = 3/10
y+x = -7/2 + 4/5 = 3/10
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Answer:
1. x+y = -2/3 + 1/3 = -1/3
y+x = 1/3 + -2/3 = -1/3
x+y = y+x
2. x+y = 4/5 + -7/2 = 3/10
y+x = -7/2 + 4/5 = 3/10