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4x=2x-6+1 4x-2x=-5 x=(-5)÷2 x=-2.5
Original formula = x (x ^ 4 + 2x ^ 2 + 1-4x ^ 2) =x(x^4-2x^2+1) =x(x^2-1)^2 =x(x+1)^2(x-1)^2
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