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afla numerele naturale a,b,c, stiind ca :
a-9=b+5=cx3
a+b+c=123


Răspuns :

b=3c-5
a=b+5+9
a=b+14
a= 3c-5+14
a=3c+9
3c+9+3c-5+c=123
7c+4=123
7c=123-4
7c=119
c=119:7
c=17