$$0.75\div(\frac{5}{6}+\frac{2}{2})x-0.2$$
$\frac{9x}{22}-0.2$
$$\frac{0.75}{\frac{5}{6}+1}x-0.2$$
$$\frac{0.75}{\frac{5}{6}+\frac{6}{6}}x-0.2$$
$$\frac{0.75}{\frac{5+6}{6}}x-0.2$$
$$\frac{0.75}{\frac{11}{6}}x-0.2$$
$$0.75\times \frac{6}{11}x-0.2$$
$$\frac{3}{4}\times \frac{6}{11}x-0.2$$
$$\frac{3\times 6}{4\times 11}x-0.2$$
$$\frac{18}{44}x-0.2$$
$$\frac{9}{22}x-0.2$$
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$\frac{9x-4.4}{22}$
