3.5y+0.8=5.5y-(1.2y+o.8)-2.4
3.5y+0.8=5.5y-1.2y-0.8-2.4
3.5y+0.8-5.5y+1.2y+0.8+2.4=0
-0.8y+4=0
-0.8y=-4
y=5