\(change\ fractions\ as\ decimals:\\\\\frac{1}{5}=\frac{1\times2}{5\times2}=\frac{2}{10}=0.2\\\\\frac{3}{5}=\frac{3\times2}{5\times2}=\frac{6}{10}=0.6\to5\frac{3}{5}=5.6\\\\therefore:\\\\\frac{1}{5}+20.3-\left(-5\frac{3}{5}\right)=0.2+20.3+5.6=26.1\)
