$$\frac{ { -3 }^{ 17 } \times (-4)-2 \times - { 3 }^{ 16 } }{ { 9 }^{ 7 } \times 15 }$$
$\frac{42}{5}=8.4$
$$\frac{-129140163\left(-4\right)-2\left(-3^{16}\right)}{9^{7}\times 15}$$
$$\frac{516560652-2\left(-3^{16}\right)}{9^{7}\times 15}$$
$$\frac{516560652-2\left(-43046721\right)}{9^{7}\times 15}$$
$$\frac{516560652-\left(-86093442\right)}{9^{7}\times 15}$$
$$\frac{516560652+86093442}{9^{7}\times 15}$$
$$\frac{602654094}{9^{7}\times 15}$$
$$\frac{602654094}{4782969\times 15}$$
$$\frac{602654094}{71744535}$$
$$\frac{42}{5}$$
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$\frac{2 \cdot 3 \cdot 7}{5} = 8\frac{2}{5} = 8.4$
