$$(10x-14y) \times (9y-4x)$$
$2\left(5x-7y\right)\left(9y-4x\right)$
$$90xy-40x^{2}-126y^{2}+56yx$$
$$146xy-40x^{2}-126y^{2}$$
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$-40x^{2}+146xy-126y^{2}$
