While you are sorting out how to attach a file (the forum software used here unfortunately is quite confusing and not user friendly defaulted) I think it dawned to me what the problem could be.
You wrote about two equations in two variables.
If these two varaibles have different units and you try to assign the result of Find to a single variable name you run into troubles, because Mathcad would not allow different units in a vector/matrix.
But there is a way out - see attached.
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