Răspuns :
12x-4y=10x+5y⇔2x=9y I ÷y
[tex]2 \frac{x}{y} =9[/tex]
[tex] \frac{x}{y} = \frac{9}{2} [/tex]
[tex]2 \frac{x}{y} =9[/tex]
[tex] \frac{x}{y} = \frac{9}{2} [/tex]