(x + 8)(x - 5) = 0
(5 - x)(5 - x) = 0
25 - 10x + x2
(x + 10)(x - 8) = 0
(x + 8)(x - 10) = 0
3x (3x - 9) = 0
9x2 - 27x = 0
x2 + 3x - 40 = 0
x2 + 2x - 80
x2 - 2x - 80
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