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5 x 4 = 20 4 x 5 = 20
1 x 20, 2 x 10, 4 x 5, 5 x 4, 10 x 2, 20 x 1 = 20
2 x 2 x 5 = 20 2 x 5 x 5 = 50
(x + 5)(x - 20) x + 5 = 0 x - 20 = 0 x = -5, 20
x2 = x+20 x2-x-20 = 0 (x-5)(x+4) = 0 x = 5 or x = -4