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D = {2, -2, 4, -4}
f(2) = 4.2 - 2 = 6
f(-2) = 4.(-2) - 2 = -10
f(4) = 4.4 - 2 = 14
f(-4) = 4.(-4) - 2 = -18
R = {-18, -10, 6, 14}
f(p) = 8
4p - 2 = 8
4p = 10
p = 10/4