$$6(x-y)^{2}-x+y-15$$
$6\left(x-y\right)^{2}+y-x-15$
$$6\left(x^{2}-2xy+y^{2}\right)-x+y-15$$
$$6x^{2}-12xy+6y^{2}-x+y-15$$
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$6x^{2}-12xy-x+6y^{2}+y-15$
