x(x+1)²-x(x²-3)-2(x+1)(x-1)=20

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x(x+1)²-x(x²-3)-2(x+1)(x-1)=20

x(x+1)²-x(x²-3)-2(x+1)(x-1)=20
x(x+1)²-x(x²-3)-2(x+1)(x-1)=20

x(x+1)²-x(x²-3)-2(x+1)(x-1)=20