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5-n-\frac{20}{25}=-\frac{15}{2.5}
Expand \frac{2}{2.5} by multiplying both numerator and the denominator by 10.
5-n-\frac{4}{5}=-\frac{15}{2.5}
Reduce the fraction \frac{20}{25} to lowest terms by extracting and canceling out 5.
\frac{25}{5}-n-\frac{4}{5}=-\frac{15}{2.5}
Convert 5 to fraction \frac{25}{5}.
\frac{25-4}{5}-n=-\frac{15}{2.5}
Since \frac{25}{5} and \frac{4}{5} have the same denominator, subtract them by subtracting their numerators.
\frac{21}{5}-n=-\frac{15}{2.5}
Subtract 4 from 25 to get 21.
\frac{21}{5}-n=-\frac{150}{25}
Expand \frac{15}{2.5} by multiplying both numerator and the denominator by 10.
\frac{21}{5}-n=-6
Divide 150 by 25 to get 6.
-n=-6-\frac{21}{5}
Subtract \frac{21}{5} from both sides.
-n=-\frac{30}{5}-\frac{21}{5}
Convert -6 to fraction -\frac{30}{5}.
-n=\frac{-30-21}{5}
Since -\frac{30}{5} and \frac{21}{5} have the same denominator, subtract them by subtracting their numerators.
-n=-\frac{51}{5}
Subtract 21 from -30 to get -51.
n=\frac{51}{5}
Multiply both sides by -1.