(x + 9) × (x - 9) = 0
x + 9 = 0
x - 8 = 0
x¹ = - 9
x² = 8
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(x + 9) × (x - 9) = 0
x + 9 = 0
x - 8 = 0
x¹ = - 9
x² = 8