a) \(-7264+\left(1543+7264\right)\)
\(=-7264+7264+1543\)
\(=1543\)
b) \(\left(144-97\right)-144\)
\(=144-97-144\)
\(=-97\)
c) \(\left(-145\right)-\left(18-145\right)\)
\(=\left(-145\right)-18+145\)
\(=-18\)
d) \(111+\left(-11+27\right)\)
\(=111-11+27\)
\(=127\)
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