$$\frac{ 15 }{ 30 } - \frac{ 12 }{ 24 } - \frac{ 6 }{ 10 } =$$
$-\frac{3}{5}=-0.6$
$$\frac{1}{2}-\frac{12}{24}-\frac{6}{10}$$
$$\frac{1}{2}-\frac{1}{2}-\frac{6}{10}$$
$$-\frac{6}{10}$$
$$-\frac{3}{5}$$
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$-\frac{3}{5} = -0.6$