apply the Maximal munch rule. Here, $x+++++y$ will be interpreted as $x++\; ++ \;\;+\; y$. So, no. of tokens are 5.
@Anirban Chand scan left to right and apply maximal munch. check here
your question is discussed in Prof. Alex Aiken's compiler course but I am not getting the link now.
then here token are
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