$$(3x-7y)(7x+2y)$$
$21x^{2}-43xy-14y^{2}$
$$21x^{2}+6xy-49yx-14y^{2}$$
$$21x^{2}-43xy-14y^{2}$$
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$\left(3x-7y\right)\left(7x+2y\right)$
