Answer:
x=17
Explanation:
374=8x-4+4x+17+9x+4
+4 +4
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378=8x+4x+17+9x+4
-17 -17
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361=8x+4x+9x+4
-4 -4
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357=8x+4x+9x
357=21x
357/21=17
x=17
Plug in 17 as x to check the answer.