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Afla numarul necunoscut:
129+11x142-5xf=1071


Răspuns :

129+1562-5*f=1071 1691-5f=1071 1691-1071=5*f f=620:5 f=124
1562-5f=1071-129
1562-5f=942
5f=1562-942
5f=620
f=620/5
f=124