$$- \frac{ 12-6 }{ -156 } -19$$
$-\frac{493}{26}\approx -18.961538462$
$$-\frac{6}{-156}-19$$
$$-\left(-\frac{1}{26}\right)-19$$
$$\frac{1}{26}-19$$
$$\frac{1}{26}-\frac{494}{26}$$
$$\frac{1-494}{26}$$
$$-\frac{493}{26}$$
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$-\frac{493}{26} = -18\frac{25}{26} = -18.96153846153846$