$$(2x+7y)(5x-8y)$$
$\left(5x-8y\right)\left(2x+7y\right)$
$$10x^{2}-16xy+35yx-56y^{2}$$
$$10x^{2}+19xy-56y^{2}$$
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$10x^{2}+19xy-56y^{2}$