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(2x + 5)² = (6 - 4x)²
4x² + 20x + 25 = 16x² - 48x + 36
12x² - 68x + 11 = 0
(6x - 1)(2x - 11) = 0
x = 1/6 atau x = 11/2
2x + 4x = 6 - 5
6x = 1
x = 1/6