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axb=b bxb=c c+9=13 ?a;? b;? c; va roggg!

Răspuns :

c+9=13, c=13-9=4
bxb=4, b=2
ax2=2, a=1
13-9 = c => c=4
bxb=c => bxb=4 => b=2
axb=b => ax2=2 => a=1