Nomor 55 . Caranya ...

=> 1/x + y = 6 || y=6-1/x
=>1/y+x=2/3 || x=2/3+1/y
=> substitusi x=2/3 + 6 - 1/x || (x+1)/x=5/6 || x+1=(5/6)x || 

hmm buntu