Question 302521
4/y +5y =21/2

4+5y^2  / y = 21/2

2(4+5y^2)=21y

8+10y^2=21y
10y^2-21y+8=0

10y^2-5y-16y +8=0

5y(2y-1)-8(2y-1)=0

(2y-1)(5y-8)=0

y=1/2  OR y= 8/5

Ananth