Daca 3y- 5x/3y-4x=6/7 aflati x/y

Răspuns :

21y - 35x = 18y -24x
3y = 11x | :y
3= 11* (x/y)

==> x / y = 3 / 11
3y-5x/3y-4x=6/7
(3y-5x)*7=(3y-4x)*6
21y-35x=18y-24x
21y-18y=35x-24x
3y=11x⇒x/y=3/11