$$(3x+5y); (19x-5y)$$
$\left(19x-5y\right)\left(3x+5y\right)$
$$57x^{2}-15xy+95yx-25y^{2}$$
$$57x^{2}+80xy-25y^{2}$$
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$57x^{2}+80xy-25y^{2}$