Rezolvare conform datelor;
k=4, 4∈N*,deci verifica
n=5
n si k fiind strict detetrminate, avem o singura valoare pt x
x=5*4 +5=20+5
x=25
C= {25}
dar e prea simplu
rezolv si alte variante
cea mai probabila
n=5. k∈N*
n=5k+5= 5(k+1)
k∈N*= {1,2,....}
k+1∈{2,3,4,...}
C={10,15,20,,,,5m....} m∈N, m≥2
sau
n∈N*, k=4
x= 4n+n=5n, n∈N*={1;2,...}
C={5;10.15;...5n..} n∈N*
