If the x-intercept of the graph of y = f(x) is located at (a, 0) and the y-intercept is located at (0, b), determine the x-intercept and y-intercept after the following transformations of the graph of y = f(x).
a) y = -f(-x)
b) y = 2f(1/2 x)
c) y + 3 = f(x - 4)
d) y + 3 = 1/2 f(1/4 (x - 4))
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