I am trying to understand a wierd symbol in a book and I am failing.
The symbol is this '$\equiv$'. I understood that if I have $32\equiv 2\bmod15$ means that if I divide $32$ with $15$ I will get $2$ as a remainder.
What if for example if i have
$$x\equiv 5 \bmod17$$ and $$x\equiv 3 \bmod23$$
How to find if there is such $x$ that satisfies both cases?