The 3+ indicates that Aluminum has a positive charge of three due to the fact that it has lost three ions.
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AlCl3+ 3NaOH = Al(OH)3+ 3NaCl
The plus symbol, "+", is used to indicate an addition.
3 plus 3 plus 3 is 9. 3 plus 3 plus 3 plus 3 plus 3 plus 3 is 18.
The answer to your question is twenty four.
15