$$4 \frac{ 7777777 }{ \frac{ 8888888 }{ 9999999 } }$$
$\frac{69999993}{2}=34999996.5$
$$4\times \frac{7777777\times 9999999}{8888888}$$
$$4\times \frac{77777762222223}{8888888}$$
$$4\times \frac{69999993}{8}$$
$$\frac{4\times 69999993}{8}$$
$$\frac{279999972}{8}$$
$$\frac{69999993}{2}$$
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$\frac{3 ^ {2} \cdot 7 \cdot 239 \cdot 4649}{2} = 34999996\frac{1}{2} = 34999996.5$
