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Gabriellisilva
a) x² - 7x = 0 b) x² + 5x = 0 c) 4x² - 9x = 0 d) 4x² - 12x = 0 e) 4x² - 7x = 0 f) x² + 7x = 0 g) x² - 8x = 0 h) x² = 7x i) x² - 4x = 0 j) x² = 4x
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