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Can you create this Mathcad 15 sheet:
Wierd! I copied and pasted your image into 15M010 and then typed the equation after each image.
On the first pass I got both answers. Putting brackets around (2-4) produced the correct answer.
I have not been able to do it again.
I can do it in Mathcad Prime 2.0 too.
I hope now You can do it too - see the Delta on the picture.
I hope too that the Delta will save you