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(gog)(-x) = g(g(-x))
21 = ((-x²)-4)² - 4
0 = ((x²-4)² - 25)
0 = x⁴-8x²+16-25
0 = x⁴-8x²-9
0 = (x²-9)(x²+1)
x² = 9, maka x = 3 atau x =-3