$$(\frac{15}{16}+\frac{5}{4})\div(\frac{7}{12}-\frac{2}{3})=$$
$-\frac{105}{4}=-26.25$
$$\frac{\frac{15}{16}+\frac{20}{16}}{\frac{7}{12}-\frac{2}{3}}$$
$$\frac{\frac{15+20}{16}}{\frac{7}{12}-\frac{2}{3}}$$
$$\frac{\frac{35}{16}}{\frac{7}{12}-\frac{2}{3}}$$
$$\frac{\frac{35}{16}}{\frac{7}{12}-\frac{8}{12}}$$
$$\frac{\frac{35}{16}}{\frac{7-8}{12}}$$
$$\frac{\frac{35}{16}}{-\frac{1}{12}}$$
$$\frac{35}{16}\left(-12\right)$$
$$\frac{35\left(-12\right)}{16}$$
$$\frac{-420}{16}$$
$$-\frac{105}{4}$$
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$-\frac{105}{4} = -26\frac{1}{4} = -26.25$
