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I need help with this problem I don’t understand it

I need help with this problem I don’t understand it-example-1

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Answer:

x = (5 + 2√7)/3

3x = 5 + 2√7

3x - 5 = +2√7

(3x - 5)² = (2√7)²

9x² - 30x + 25 = 28

9x² - 30x - 3 = 0

3x² - 10x - 1 = 0

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