Solve for n
n=\frac{2}{5}=0.4
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n=\frac{4}{5}-\frac{2}{5}
Subtract \frac{2}{5} from both sides.
n=\frac{4-2}{5}
Since \frac{4}{5} and \frac{2}{5} have the same denominator, subtract them by subtracting their numerators.
n=\frac{2}{5}
Subtract 2 from 4 to get 2.
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