a = 0,9999...
10a = 9,9999...
10a = 9 + 0,9999...
10a = 9 + a
9a = 9
a = 1
0,9999... = 1
???
a = 0,9999...
10a = 9,9999...
10a = 9 + 0,9999...
10a = 9 + a
9a = 9
a = 1
0,9999... = 1
???
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