$$H=( \frac { 3 } { 10 } - \frac { 2 } { 5 } )-( - \frac { 3 } { 2 } - \frac { 4 } { 10 } )$$
$H = \frac{9}{5} = 1\frac{4}{5} = 1.8$
$$H=\frac{3}{10}-\frac{4}{10}-\left(-\frac{3}{2}-\frac{4}{10}\right)$$
$$H=\frac{3-4}{10}-\left(-\frac{3}{2}-\frac{4}{10}\right)$$
$$H=-\frac{1}{10}-\left(-\frac{3}{2}-\frac{4}{10}\right)$$
$$H=-\frac{1}{10}-\left(-\frac{3}{2}-\frac{2}{5}\right)$$
$$H=-\frac{1}{10}-\left(-\frac{15}{10}-\frac{4}{10}\right)$$
$$H=-\frac{1}{10}-\frac{-15-4}{10}$$
$$H=-\frac{1}{10}-\left(-\frac{19}{10}\right)$$
$$H=-\frac{1}{10}+\frac{19}{10}$$
$$H=\frac{-1+19}{10}$$
$$H=\frac{18}{10}$$
$$H=\frac{9}{5}$$
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$H≔\frac{9}{5}$
