Răspuns:
74/85
Explicație:
(4x+3y) / (7x-2y) = 19 / 12 <=>
12(4x+3y) = 19(7x-2y) <=>
48x +36y = 133x - 38y <=>
133x-48x = 36y+38y <=>
85x = 74y => x/y = 74/85