1) (x+1)(x²-x+1)-x(x²-3)=4 2) (x-3)(x²-3x+9)+x(5-x²)=6x 3) (5x-1)(5x+1)=25x²-7x+15 4) (3x-5)(x+1)-(3x-1)(x+1)=x-4 5) (x-2)(x+3)-(x+4)(x-7)=5-x

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