$$H=( \frac { 3 } { 10 } - ( \frac { 2 } { 5 }$$
$H=-\frac{1}{10}=-0.1$
$$H=\frac{3}{10}-\frac{4}{10}$$
$$H=\frac{3-4}{10}$$
$$H=-\frac{1}{10}$$
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$H≔-\frac{1}{10}$