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(2x-1)(x²-3)+(2x-1)(1-2x²)=(2x-1)(x²-3+1-2x²)=(2x-1)(-2-x²)
(2x-1)(x²-3)+(2x-1)(1-2x²)=
(2x-1)[x²-3+1-2x²]=
(2x-1)(-x²-2)=
-(2x-1)(x²+2)