{15 –[4+(32 –45)][10 –(-10+ 7)]}
b){10–[6+(-12 –5)][17–(15-23)]}
c)4{15[-2 (7–9)][-5(-12-7)]}
d){15 –[(32 –45)(-8–10)][(10+23)–(-10+ 7)]}
e)(32 –32){–5[(28–54)][(15–11)(-10+ 7)]}
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