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\frac{8}{11}-\frac{9}{10}
Convert decimal number 0,9 to fraction \frac{9}{10}.
\frac{80}{110}-\frac{99}{110}
Least common multiple of 11 and 10 is 110. Convert \frac{8}{11} and \frac{9}{10} to fractions with denominator 110.
\frac{80-99}{110}
Since \frac{80}{110} and \frac{99}{110} have the same denominator, subtract them by subtracting their numerators.
-\frac{19}{110}
Subtract 99 from 80 to get -19.