$$(-2/5+3/10)+-5$$
$-\frac{51}{10}=-5.1$
$$-\frac{2}{5}+\frac{3}{10}-5$$
$$-\frac{4}{10}+\frac{3}{10}-5$$
$$\frac{-4+3}{10}-5$$
$$-\frac{1}{10}-5$$
$$-\frac{1}{10}-\frac{50}{10}$$
$$\frac{-1-50}{10}$$
$$-\frac{51}{10}$$
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$-\frac{51}{10} = -5\frac{1}{10} = -5.1$