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(5x + 1)² = (2x - 2)²
(5x + 1)² - (2x - 2)² = 0
(5x + 1 - 2x + 2) (5x + 1 + 2x - 2) = 0
(3x + 3) (7x - 1) = 0
x = -1
x = 1/7