$$\frac{ \frac{ 1 }{ 2 } -1 }{ 20-(-15) }$$
$-\frac{1}{70}\approx -0.014285714$
$$\frac{\frac{1}{2}-\frac{2}{2}}{20-\left(-15\right)}$$
$$\frac{\frac{1-2}{2}}{20-\left(-15\right)}$$
$$\frac{-\frac{1}{2}}{20-\left(-15\right)}$$
$$\frac{-\frac{1}{2}}{20+15}$$
$$\frac{-\frac{1}{2}}{35}$$
$$\frac{-1}{2\times 35}$$
$$\frac{-1}{70}$$
$$-\frac{1}{70}$$
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$-\frac{1}{70} = -0.014285714285714285$
