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Works as well in C# with recursion private int Valuate(string text, int index) { if (index >= text.Length) { return 0; } if (text[index].ToString().Equals("x")) { text = text.Remove(index, 1); index = index - 2; if (index < 0) { index = 0; } return 0 + Valuate(text, index); } else { int nu...