(X × 10 - X)/9 = X
Correct?
Now use 0.9999... for X
0.9999... × 10 = 9.9999...
9.9999... - 0.9999 = 9
9 / 9 = 1
Simple, right?
(X × 10 - X)/9 = X
Correct?
Now use 0.9999... for X
0.9999... × 10 = 9.9999...
9.9999... - 0.9999 = 9
9 / 9 = 1
Simple, right?
Spoiler: I'm a seer