$$6 \frac { 2 } { 3 } \cdot 2 \frac { 1 } { 4 } \cdot ( - \frac { 1 } { 2 } ) \cdot \frac { 2 } { 5 } n$$
$-3n$
$$\frac{18+2}{3}\times \frac{2\times 4+1}{4}\left(-\frac{1}{2}\right)\times \frac{2}{5}n$$
$$\frac{20}{3}\times \frac{2\times 4+1}{4}\left(-\frac{1}{2}\right)\times \frac{2}{5}n$$
$$\frac{20}{3}\times \frac{8+1}{4}\left(-\frac{1}{2}\right)\times \frac{2}{5}n$$
$$\frac{20}{3}\times \frac{9}{4}\left(-\frac{1}{2}\right)\times \frac{2}{5}n$$
$$\frac{20\times 9}{3\times 4}\left(-\frac{1}{2}\right)\times \frac{2}{5}n$$
$$\frac{180}{12}\left(-\frac{1}{2}\right)\times \frac{2}{5}n$$
$$15\left(-\frac{1}{2}\right)\times \frac{2}{5}n$$
$$\frac{15\left(-1\right)}{2}\times \frac{2}{5}n$$
$$\frac{-15}{2}\times \frac{2}{5}n$$
$$-\frac{15}{2}\times \frac{2}{5}n$$
$$\frac{-15\times 2}{2\times 5}n$$
$$\frac{-15}{5}n$$
$$-3n$$
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