$$\frac{-9.8\times10^{8}-4.9\times10^{8}}{7.0\times10^{7}}$$
$-21$
$$\frac{-9.8\times 100000000-4.9\times 10^{8}}{7\times 10^{7}}$$
$$\frac{-980000000-4.9\times 10^{8}}{7\times 10^{7}}$$
$$\frac{-980000000-4.9\times 100000000}{7\times 10^{7}}$$
$$\frac{-980000000-490000000}{7\times 10^{7}}$$
$$\frac{-1470000000}{7\times 10^{7}}$$
$$\frac{-1470000000}{7\times 10000000}$$
$$\frac{-1470000000}{70000000}$$
$$-21$$
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