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(20x^{2} +x-1)*20
20x^{2} + 1(20x) - 20
(20x + 5) (20x - 4)
4 n^{2} + n - 33
(4 n^{2} + n - 33) * 4
4n^{2} + 1(4n) - 132
(4n + 12) (4n - 11)