Because you get a different answer when take 10X - X = 9X (with x= .9^)... and when you simply multiply by 9X.
Ill show you with whole numbers:
5*10 - 5 = 45
5 * 9 = 45
However, with .9^:
10X - X = 9X=9 (x=1 using adrian's 'proof')
9X = 8.9^1 (x=.9^)
This has come up with a different answer (entirely) from x=1. These two equations should in theory give the same answer, but they do not.
Ill show you with whole numbers:
5*10 - 5 = 45
5 * 9 = 45
However, with .9^:
10X - X = 9X=9 (x=1 using adrian's 'proof')
9X = 8.9^1 (x=.9^)
This has come up with a different answer (entirely) from x=1. These two equations should in theory give the same answer, but they do not.
Please give me a home where cloud buffalo roam
Where the dear and the strangers can play
Where sometimes is heard a discouraging word
But the skies are not stormy all day