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1)a+b+c=721 b=ax3 b=c-21 a=?b=?c=? si 2)a+b+c=18 a=5 b=c+1 b=?c=?

Răspuns :

3a=c-21
a+3a+3a+21=721
7a=700
a=100
b=300
c=279
b) 5+c+1+c=18
2C=12
c=6
b=7