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Daca se scade 19% dintr-un nr se obtine 567.Aflati nr.

Răspuns :

x-19x/100=567
100x/100-19x/100=56700/100
81x=56700
x=700
x-19%*x=567
x-19*x/100=567
100x-19x=56700
81x=56700
x=56700:81
x=700