If 15/x + x/5 = 4, find the value(s) of x.

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• A 1,5
• B 5,15
• C 3,15
• D 2,5

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Answer: B. 5,15

Multiply both sides by 5x: 75 + x² = 20x, so x² - 20x + 75 = 0.
(x - 5)(x - 15) = 0, so x = 5 or x = 15.

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