Answer
$-15$
Work Step by Step
Recall:
$\frac{a}{b} \div \frac{c}{d} = \frac{a}{b} \times \frac{d}{c}$
Thus,
$6 \div \left(-\frac{2}{5}\right)
\\=6 \times \left(-\frac{5}{2}\right)
\\=-\frac{30}{2}
\\=-15$
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