We know that y = 5/5y, since 5/5 = 1. and 1y = y.
5/5y + 2/5y = ((5+2)/5)*y = 7/5*y, so y + 2/5y = 7/5y.
With that logic, 5/5y - 2/5y = 3/5 y.
The last choice is y + 0.32y = 1.32y.
