Originally Posted by Patrick

10 x 0.999... = 9.999...

c = 0.999...

10c = 9.999...

10c - c = 9.999... - 0.999...

9c = 9

c = 1
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This is what i did after those steps
d = 1

c = d

10d = 9.999...

10d-d = 9.999...-d

10d-d=9.9999...-1

9d=8.999...

9c=8.999....

c=8.999.../9 therefore c does not equal 1
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Another way of doing it

c=.999...
10 x .999...=9.999...
10 x c=9.999...
c=.999

10d = 10