$$(- \frac{ 6 }{ 15 } ) \div ( \frac{ 4 }{ 35 } )$$
$-\frac{7}{2}=-3.5$
$$\frac{-\frac{2}{5}}{\frac{4}{35}}$$
$$-\frac{2}{5}\times \frac{35}{4}$$
$$\frac{-2\times 35}{5\times 4}$$
$$\frac{-70}{20}$$
$$-\frac{7}{2}$$
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$-\frac{7}{2} = -3\frac{1}{2} = -3.5$