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4x² - 12x + 9 = 5
→ 4x² - 12x + 4 = 0
→ x² - 3x + 1 = 0
→ x = (-(-3) ±√((-3)² - 4×1×1))/(2×1)
→ x = (3 ±√5)/2
→ x = (3 + √5)/2 or x = (3 - √5)/2
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