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Aflati pe a din:
5+5{[5+5✖(a-5)]:5-5}=10


Răspuns :

a =10
nu l-am descris perfect dar sper ca e bine
5+5{[5+5x(a-5)]:5-5}=10
5{[5+5x(a-5)]:5-5}=5
{[5+5x(a-5)]:5-5}=1
[5+5x(a-5)]:5=6
5+5x(a-5)=30
5x(a-5)=25
a-5=5
a=10