$$\frac{ 7p+8 }{ 9 } =9$$
$p = \frac{73}{7} = 10\frac{3}{7} \approx 10.428571429$
$$7p+8=9\times 9$$
$$7p+8=81$$
$$7p=81-8$$
$$7p=73$$
$$p=\frac{73}{7}$$
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