$$5 ( 2 \frac { - 4 } { 7 } - 1 )$$
$\frac{15}{7}\approx 2.142857143$
$$5\left(\frac{14-4}{7}-1\right)$$
$$5\left(\frac{10}{7}-1\right)$$
$$5\left(\frac{10}{7}-\frac{7}{7}\right)$$
$$5\times \frac{10-7}{7}$$
$$5\times \frac{3}{7}$$
$$\frac{5\times 3}{7}$$
$$\frac{15}{7}$$
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$\frac{3 \cdot 5}{7} = 2\frac{1}{7} = 2.142857142857143$
