8x^2(x+3)-8x(x+1)^2=8x^2-32

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8x^2(x+3)-8x(x+1)^2=8x^2-328x^2(x+3)-8x(x+1)^2=8x^2-328x^2(x+3)-8x(x+1)^2=8x^2-32x=4

8x^2(x+3)-8x(x+1)^2=8x^2-32
8x^2(x+3)-8x(x+1)^2=8x^2-32

8x^2(x+3)-8x(x+1)^2=8x^2-32
x=4