A+B+C=19692
B=3A+6932
C=2A+12700
Inlocuim in prima ecuatie B si C cu termeni de mai jos.Vom scrie in felul urmator:
A+3A+6932+2A+12700=19692
6A+6932=19692-12700
6A+6932=6992
6A=6992-6932
6A=60
A=60:6
A=10
B=3x10+6932
B=30+6932
B=6962
C=2x10+12700
C=20+12700
C=12720
Verificare:
10+6962+12720=19692