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Afla nr necunoscut 17380+(9909 +a)=43165

Răspuns :

17380+(9909 +a)=43165

9909 + a = 43165-17380

9909 + a = 25875

a = 25875 - 9909

a = 15876

17380+(9909+a)=43165

9909+a=43165-17380=25785

a=25785-9909

a=15876