`(10/21 + 1/3) -y=16/21`
`=> ( 10/21 + 7/21)-y=16/21`
`=> 17/21 -y=16/21`
`=> y= 17/21-16/21`
`=> y=1/21`
__
`x/35 =3/35`
`=> x=3`
(\(\dfrac{10}{21}\)+\(\dfrac{1}{3}\))-y=\(\dfrac{16}{21}\)
\(\dfrac{17}{21}\)-y=\(\dfrac{16}{21}\)
y=\(\dfrac{17}{21}\)-\(\dfrac{16}{21}\)
y=\(\dfrac{1}{21}\)