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1. \(75 + (-25) =\)
 
2. \(171 +\)  \(= 0\)
 
3. \([(-3) + (-12)] + (-77) =\)     \(+ [[-12) +(-77)]\)
 
4. \((-42) + [\)  \(+ (-23)] =\) \([\) \(+ 15]\) \(+\)