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Answer :

Answer:

17

Step-by-step explanation:

[tex]8x - 4 + 9x + 4 + 4x + 17 = 374 \\\ 21x + 17 = 374 \\\ 21x = 374 - 17 \\\ 21x = 357 \\\ x = \frac{357}{21} \\\\\\ x = 17[/tex]

I hope I've helped you.