(-x)^5 = (-3)^5= -243, x^4 = (-3)^4=81 и при умножении на 2 81 *2 = 162, -243+162 = -81
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(-x)^5 = (-3)^5= -243, x^4 = (-3)^4=81 и при умножении на 2 81 *2 = 162, -243+162 = -81