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Small note that there is a "4th" case, in case (3) when 2d - 40 = d + 20 we get 80 = 80 but the angle 80 only needs to appear "at least once", therefore we can have an 80 - 80 - 20 triangle or 80 - 50 - 50 triangle. However, the 4th case has an x of 50 so it does not contribute a new value, hence the answer is still the same as if we don't consider the 4th case.
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