1/ x2 – 9 = 0 2/ 3x3 – 12x = 0
3/ x(2x – 7) – (4x – 14) = 0 4/ 7x2 – 28 = 0
5/ 5x(x – 3) – 2x + 6 = 0 6/ (12x - 5)(4x - 1) + (3x - 7)(1 - 16x) = 81
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