$$7/(20OF3-5+6)+9$$
$\frac{4\left(45F_{3}O+4\right)}{20F_{3}O+1}$
$$\frac{7}{20OF_{3}+1}+9$$
$$\frac{7}{20OF_{3}+1}+\frac{9\left(20OF_{3}+1\right)}{20OF_{3}+1}$$
$$\frac{7+9\left(20OF_{3}+1\right)}{20OF_{3}+1}$$
$$\frac{7+180OF_{3}+9}{20OF_{3}+1}$$
$$\frac{16+180OF_{3}}{20OF_{3}+1}$$
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$-\frac{140O}{\left(20F_{3}O+1\right)^{2}}$