Fine, how's this?
The first says that we haven't proved that 0.9 = 1
So 0.9 = X
10X = 9.9
10X - 0.9 = 9.9 - 0.9
10X - 0.9 = 9
10X/10 - 0.9/10 = 9/10
X - 0.09 = .9
X = .9 + 0.09
X = .99
That just proved that 0.9 is equal to itself, not that 0.9 is equal to 1.
