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bonjour

x² - 36 = ( x - 6 ) ( x + 6 )

5 x - 3 x² = x ( 5 - 3 x )

3 x - 12 = 3 ( x - 4 )

25 a² - 1 = ( 5 a - 1 ) ( 5 a + 1 )

21 x² - 14 x =  7 x ( 3 x - 2 )