5x - (4-2x+x²)(x+2) + x(x-1)(x+1)=
=5x- (4x-2x²+x³+8-4x+2x²) + x³-x= 5x-x³-8+x³-x= 4x-8
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5x - (4-2x+x²)(x+2) + x(x-1)(x+1)=
=5x- (4x-2x²+x³+8-4x+2x²) + x³-x= 5x-x³-8+x³-x= 4x-8