(-1 ) + ( 1 ) + ( -1 ) + 1 + ( -1 ) + 1 equal.
A. -6
B. 0
C. 1
D. 6
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(-1 ) + ( 1 ) + ( -1 ) + 1 + ( -1 ) + 1 equal.
A. -6
B. 0
C. 1
D. 6
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