determ.nr. nat x: 3x+1/2x+5 din252 este20

Răspuns :

[tex]( \frac{3x+1}{2x+5} )*252=20[/tex]

[tex] \frac{252(3x+1)}{2x+5} =20;252(3x+1)=20(2x+5);756x+252=40x+100;[/tex]

[tex]716x=-152;x=(- \frac{152}{716} );x= \frac{38}{179} [/tex]