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(x.x²)(x.4xy)(x.16y) + (-4y.x²)(-4y.4xy)(-4y.16y)
x³+4x²y+16xy - 4x²y-16xy²-64y²
x³ - 64y² + 16xy - 16xy² + 4x²y - 4x²y
x³-64y²+16xy-16xy²