$$\frac { -1 } { 6 } e t \frac { -7 } { 48 }$$
$\frac{7et}{288}$
$$-\frac{1}{6}et\times \frac{-7}{48}$$
$$-\frac{1}{6}et\left(-\frac{7}{48}\right)$$
$$\frac{-\left(-7\right)}{6\times 48}et$$
$$\frac{7}{288}et$$
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$\frac{7e}{288}$
