Answer :

10x=1.1...
x=0.1...
Then subtract the two equations from each other:
9x=1
Solve for x:
x=1/9
[tex]x=0.\overline{1}\\10x=1.\overline{1}\\ 10x-x=1.\overline{1}-0.\overline{1}\\ 9x=1\\ x=\dfrac{1}{9} [/tex]

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