$$\frac{ -3 }{ 5 } \times \frac{ -1 }{ 2 } + \frac{ -3 }{ 5 } \times \frac{ 3 }{ 4 }$$
$-\frac{3}{20}=-0.15$
$$-\frac{3}{5}\times \frac{-1}{2}+\frac{-3}{5}\times \frac{3}{4}$$
$$-\frac{3}{5}\left(-\frac{1}{2}\right)+\frac{-3}{5}\times \frac{3}{4}$$
$$\frac{-3\left(-1\right)}{5\times 2}+\frac{-3}{5}\times \frac{3}{4}$$
$$\frac{3}{10}+\frac{-3}{5}\times \frac{3}{4}$$
$$\frac{3}{10}-\frac{3}{5}\times \frac{3}{4}$$
$$\frac{3}{10}+\frac{-3\times 3}{5\times 4}$$
$$\frac{3}{10}+\frac{-9}{20}$$
$$\frac{3}{10}-\frac{9}{20}$$
$$\frac{6}{20}-\frac{9}{20}$$
$$\frac{6-9}{20}$$
$$-\frac{3}{20}$$
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$-\frac{3}{20} = -0.15$
