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(-5)^4 + 3(-5)^3 - 9(-5)^2 + 4(-5) - 5 =
625 + 3(-125) - 9*25 - 20 - 5 =
625 + 3(-125) - 9*25 - 20 - 5 =
625 - 375 -225 - 20 - 5 = 0