0
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38 + 39 = 77
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39
x2 + 2x - 38 = 0 ∴ x2 + 2x + 1 = 39 ∴ (x + 1)2 = 39 ∴ x + 1 = ±√39 ∴ x = -1 ±√39
244
39+38+...+1 = 39*38/2 = 494
39 plus 89 plus 80 is equal to 208.