(4900:y-280):60=7 Помогите

Question

(4900:y-280):60=7
Помогите

Answer 1

(4900:у-280):60=7
1/4900y-280:60=7
1/4900y-4 2/3=7
1/4900y=11 2/3
1/4900y=35/3
y=1/3:1/140
y=1/420