[tex] \frac{7x+y}{y} = \frac{21}{16} [/tex]
[tex] \frac{7x}{y} + \frac{y}{y} = \frac{21}{16} [/tex][tex] \frac{7x}{y} +1= \frac{21}{16} [/tex]
[tex] \frac{7x}{y} = \frac{21}{16} -1[/tex]
aducem la acelasi numitor in partea dreapta
[tex] \frac{7x}{y} = \frac{21-16}{16} = \frac{5}{16} [/tex]
impartim cu 7 totul
[tex] \frac{x}{y} = \frac{5}{7*16} = \frac{5}{112} [/tex]
