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x (16-9x) = 0
x = 0 , 16-9x = 0 ↔ x= 16/9
(x = 0) ( x=16/9)
x² - 6x - 40 = O
x -10 = x-10 = (x =10)
x + 4 = x +4 = (x = -4)
6x² + 7x + 2
3x + 2 = 3x+ 2 = ( x = -2/3)
2x +1 = 2x + 1 = (x = -1/2)