$$\frac{ 18-18+2 \times 109 }{ 156-113-178 }$$
$-\frac{218}{135}\approx -1.614814815$
$$\frac{2\times 109}{156-113-178}$$
$$\frac{218}{156-113-178}$$
$$\frac{218}{43-178}$$
$$\frac{218}{-135}$$
$$-\frac{218}{135}$$
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$-\frac{218}{135} = -1\frac{83}{135} = -1.614814814814815$