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9x2 + 8x - 1 = (9x - 1)(x + 1)
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x2-9x+8=0 has two solutions:x = 8x = 1
8x+9=9x-18+9 = 8x+9=9x-9 = 1x=0 (:
9x + 3x - 9x = 6 + 8x - 113x = 8x - 11-5x = -11x = 2.2 or 11/5
(x+1)(x+8)
(3x - y+ 2)(3x + y + 2)