The answer is 0.
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3 + 3 - 7 + 2 - 1 + 109 = 109
4
(10+9)+(1−1)+(2−2)+(3−1)+(4−4) = 21This is the same equation rewritten: (10+9)+(3−1) = 21This can be done as 1-1, 2-2, 4-4 cancel themselves out.
-1
-1