tentukan nilai y elemen r sbg 1/10(1/9(1/5(2y+3/3)+6)+8)=1

1/10(1/9(2y/5+1/5+6)+8=1
1/10(1/9(2y/5+31/5)+8=1
1/10(2y/45+31/45+8)=1
2y/450+391/450=1
2y + 391 = 450
2y = 59
y = 29.5