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nr minim=2
y-nr de probleme rezolvate de Cosmin
x+y=18
x-y=2 adunam cele 2 ecuatii
2x /=20
x=10
y=18-10
y=8
M = C + 2 2 - NR. MINIM
C + 2 + C = 18
2C = 18 - 2
C = 16 : 2
C = 8 PROBLEME
M = 8 + 2
M = 10 PROBLEME