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The greatest integer function is defined as `f(x) = |__x__|` where f(x) is an integer less than or equal to x.
The function `f(x) = -3*|__x__|` has to be graphed.
From the graph it is seen that for x = 0, f(x) = 0, for x = 1, f(x) = -3 and for x = 1/2, f(x) = 0
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