-20 = -20
16 - 36 = 25 - 45
(4)2 - (9 x 4) = (5)2 - 9 x 5
(4)2 - (9 x 4) + (81 / 4) = (5)2 - 9 x 5 + (81 / 4)
[4 - (9 / 2)]2 = [5 - (9 / 2)]2
[4 - (9 /2)] = [5 - (9 / 2)]
4 = 5 - (9 / 2) + (9 / 2)
4 = 5
???...
[yang berwarna kuning adalah gandaan dua - kuasa dua]