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x² - 6x -7 = 0
(x + 1) (x - 7) = 0
x = -1, x = 7
(x^2 -6x +2)= 9
x^2 -6x +2-9= 0
x^2 -6x -7= 0
(x -7)(x+1)=0
x-7 = 0
x=7
atao
x+1=0
x=-1