72–4у–0,5=65
72–4,5у=65
–4,5у=65–72
–4,5у=–7
у=9/14
Пошаговое объяснение:
4(18-у)-0,5у=65
72-4y-0.5y-65=0
-4.5y+7=0
-4.5y=-7
y=7/4.5
y=7 ÷4 5/10
y = 7÷45/10
y = 7 * 10/45
y = 1 5/9
