3. Let f(x) = x - r - 3x. Determine the interval(s) on which f(x) is increasing and the interval(s) on which f(x) is decreasing, and find the x coordinates of all local maxima and minima. Then determine the interval(s) on which f(x) is concave up and the interval(s) on which f(x) is concave down, and find the x coordinates of all inflection points.

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