We can do this by using the formula for the slope of a line, which is $\frac{y_2 - y_1}{x_2 - x_1}$. In this case, we have the points (20, -8) and (9, -8). Plugging these values into the formula, we get $\frac{-8 - (-8)}{9 - 20} = \frac{0}{-11} = 0$. So the slope
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