$$x(6x-y)-y(2x-4y)=$$
$6x^{2}-3xy+4y^{2}$
$$6x^{2}-xy-y\left(2x-4y\right)$$
$$6x^{2}-xy-\left(2yx-4y^{2}\right)$$
$$6x^{2}-xy-2yx-\left(-4y^{2}\right)$$
$$6x^{2}-xy-2yx+4y^{2}$$
$$6x^{2}-3xy+4y^{2}$$
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