$$\frac { ( - 3 ) ^ { 17 } \cdot ( - 4 ) - 2 \cdot ( - 3 ) ^ { 16 } } { 9 ^ { 7 } \cdot 15 }$$
$6$
$$\frac{-129140163\left(-4\right)-2\left(-3\right)^{16}}{9^{7}\times 15}$$
$$\frac{516560652-2\left(-3\right)^{16}}{9^{7}\times 15}$$
$$\frac{516560652-2\times 43046721}{9^{7}\times 15}$$
$$\frac{516560652-86093442}{9^{7}\times 15}$$
$$\frac{430467210}{9^{7}\times 15}$$
$$\frac{430467210}{4782969\times 15}$$
$$\frac{430467210}{71744535}$$
$$6$$
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$2\times 3$