Solve for a
a=\frac{1}{5}=0.2
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a=1-\frac{4}{5}
Subtract \frac{4}{5} from both sides.
a=\frac{5}{5}-\frac{4}{5}
Convert 1 to fraction \frac{5}{5}.
a=\frac{5-4}{5}
Since \frac{5}{5} and \frac{4}{5} have the same denominator, subtract them by subtracting their numerators.
a=\frac{1}{5}
Subtract 4 from 5 to get 1.
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