4.7y-(2.5y+12.4)=1.9
4.7y-2.5y-12.4=1.9
2.2y=1.9+12.4
2.2y=14,3
y=14,3:2.2
y= 6,5
4,7y - (2.5y+12.4)=1.9
2.2y=14.3
y=6.5