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[(28 + 42) : 7 + (13 + 11) : 3] : 2 = 9
Verificare:
[(28 + 42) : 7 + (13 + 11) : 3] : 2 = 9
[ 70 : 7 + 24 : 3] : 2 = 9
[ 10 + 8] : 2 = 9
18 : 2 = 9 (corect)