Răspuns :

Robertiosaid
a+b+c=23
b=a+3
c=b+2 => c=a+3+2 => c=a+5
a+a+3+a+5=23
3a+8=23
3a=15 => a=5
b=a+3
b=5+3
b=8
c=a+5
c=5+5
c=10
a+b+c=23
5+8+10=23
13+10=23
23=23

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