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5. Calculaţi:
a. 9-5-(7-12)-{5-[6+(6-9)-3]+11}
b. 4-3-{5+[6-7-(3-6+9)+(2-7)]}
c. 13-{14-15+[(15-16)+2-5]-(-5+7)}
d. -9+{5-9-[13-(4-8)+(7+3-12)]-(-9)}=​