() (- 2) fill in a number in the first two spaces, that is, the sum of the first two numbers is 3 less than the sum of the last two numbers, and the sum of the three numbers is 0

It's - 5 and 7
-5 + 7 = 2; 7 + (- 2) = 5, the former is 3 smaller than the latter
-5+7+（-2）=0

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