How are equation of that form $a^x\equiv b \mod n$ often named? How are equation of that form $a^x\equiv b \mod n$ usually named? I am trying to solve $7^x\equiv 6 \mod 17$ but I am having troubles doing so for I don't know enough properties of this kind of equations and can't find proper explanation because of etymological issues. I would appreciate any reference or help either with trying to solve it or with referring my lacking information in that matter. Note: I am not native and my English is poor.

it is called "discrete logarithm" or "discrete logarithm problem".
This is a very hard problem to solve in general, it is used in cryptography.
This means, there is probably no 'nice' way to solve it, so i suggest to try every number from 1 to 16 for $x$
