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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