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Aflati n apartine N daca 3n+5 pe 2n+1 si 5 pe 3 sunt echivalente

Răspuns :

[tex] \frac{3n+5}{2n+1} = \frac{5}{3} =\ \textgreater \ 3(3n+5)=5(2n+1)=\ \textgreater \ 9n+15=10n+5 \ \textless \ =\ \textgreater \ [/tex]
[tex]-n= -10 |*(-1)= n=10 =\ \textgreater \ n=10[/tex]