$$3(x+y)\times5(x-y; x(x-y$$
$15x\left(x^{2}-y^{2}\right)$
$$15x\left(y-x\right)\left(x+y\right)$$
$$-15x^{3}+15xy^{2}$$
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$15\left(x^{2}-y^{2}\right),\ x\left(x-y\right)$
