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a:b= 5 rest 2 
a=717
b=?


Răspuns :

a=5b+2
a=717
5b+2=717
5b=715
b=143
a : b = 5 rest 2 => a = 5b + 2
717 = 5b + 2
717 - 2 = 5b
715 = 5b
b = 715 : 5 = 143