Răspuns :
A+B+C=119
A=3B
A=C+7=>C=A-7=>C=3B-7
INLOCUIM:
3B+B+3B-7=119
7B=126
B=18
A=3X18=>A=54
C=3X18-7=>C=47
A=3B
A=C+7=>C=A-7=>C=3B-7
INLOCUIM:
3B+B+3B-7=119
7B=126
B=18
A=3X18=>A=54
C=3X18-7=>C=47