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What is the value of the unknown node?

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I believe that the ? is

101

My workings:

In the beginning, I found 2 nodes with relatively smaller values to start with: $7$ & $28$.
I tried $7\times28$ which gave me a result of $196$.
Since $196$ is sort of close to the number $161$ on the edge, I tried $196-161$ which gave me $35$.
Also, $7+28$ gave me the result of $35$.
Then I set up an equation to find the missing node:
$(79\times?)-(79+?)=7799$
After solving the equation, I discovered that the $?$ was $101$.

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  • $\begingroup$ Nice going on the algebra skills! $\endgroup$
    – Galen
    Commented Apr 29, 2020 at 1:51
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    $\begingroup$ Thanks :) These nodes really gave my brain a proper workout! $\endgroup$
    – H_D
    Commented Apr 29, 2020 at 1:52

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