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\frac{125}{25}-n-\frac{2}{25}=-\frac{15}{25}
Convert 5 to fraction \frac{125}{25}.
\frac{125-2}{25}-n=-\frac{15}{25}
Since \frac{125}{25} and \frac{2}{25} have the same denominator, subtract them by subtracting their numerators.
\frac{123}{25}-n=-\frac{15}{25}
Subtract 2 from 125 to get 123.
\frac{123}{25}-n=-\frac{3}{5}
Reduce the fraction \frac{15}{25} to lowest terms by extracting and canceling out 5.
-n=-\frac{3}{5}-\frac{123}{25}
Subtract \frac{123}{25} from both sides.
-n=-\frac{15}{25}-\frac{123}{25}
Least common multiple of 5 and 25 is 25. Convert -\frac{3}{5} and \frac{123}{25} to fractions with denominator 25.
-n=\frac{-15-123}{25}
Since -\frac{15}{25} and \frac{123}{25} have the same denominator, subtract them by subtracting their numerators.
-n=-\frac{138}{25}
Subtract 123 from -15 to get -138.
n=\frac{138}{25}
Multiply both sides by -1.