$$(15)^{3}+(-9)^{3}+(-6)^{3}$$
$2430$
$$3375+\left(-9\right)^{3}+\left(-6\right)^{3}$$
$$3375-729+\left(-6\right)^{3}$$
$$2646+\left(-6\right)^{3}$$
$$2646-216$$
$$2430$$
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$2\times 3^{5}\times 5$