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Verified answer
|6x - x| = |2x + 3|(5x)² = (2x + 3)²
25x² = 4x² + 12x + 9
21x² - 12x - 9 = 0
7x² - 4x - 3 = 0
(7x + 3)(x - 1) = 0
x = -3/7 atau x = 1
jadi HP : {-3/7 , 1}