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Determinati pe x, stiind ca:
x+3/x+11=2/3


Răspuns :

         
[tex] \frac{x+3}{x+11} = \frac{2}{3} \\ \\ 3(x+3)=2(x+11) \\ 3x+9=2x+22 \\ 3x - 2x=22-9 \\ x=\boxed{13}[/tex]