$$\frac{17}{7}X-18=\frac{20}{7}$$
$X = \frac{146}{17} = 8\frac{10}{17} \approx 8.588235294$
$$\frac{17}{7}X=\frac{20}{7}+18$$
$$\frac{17}{7}X=\frac{20}{7}+\frac{126}{7}$$
$$\frac{17}{7}X=\frac{20+126}{7}$$
$$\frac{17}{7}X=\frac{146}{7}$$
$$X=\frac{146}{7}\times \frac{7}{17}$$
$$X=\frac{146\times 7}{7\times 17}$$
$$X=\frac{146}{17}$$
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