$$\frac{ 2 }{ 5 } \times (- \frac{ 3 }{ 7 } )- \frac{ 1 }{ 14 }$$
$-\frac{17}{70}\approx -0.242857143$
$$\frac{2\left(-3\right)}{5\times 7}-\frac{1}{14}$$
$$\frac{-6}{35}-\frac{1}{14}$$
$$-\frac{6}{35}-\frac{1}{14}$$
$$-\frac{12}{70}-\frac{5}{70}$$
$$\frac{-12-5}{70}$$
$$-\frac{17}{70}$$
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$-\frac{17}{70} = -0.24285714285714285$
