ιт ιѕ -77
нσρє ι ¢συк∂ нєℓρ υ συт тσ∂αу!!!!!!
Answer: -77
Reasoning:
77+77=154 (NOPE)
77+(-77)=0 (YES)
77+0=77 (NOPE)
77+(-76)=1 (NOPE)
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