0.7 (repeating) is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is 7/9 which cannot be simplified.
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The fraction of the repeating decimal 0.7... is 7/9
7/15
It is: 7/15
It is 7/6.
If all three digits are repeating then as a fraction it is 7/37 in its simplest form