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*From*: Jefferson Andrade <joandrade@xxxxxxxxx>*Date*: Thu, 27 May 2021 13:11:15 -0700 (PDT)

Hello,

I want to write a (piece of a) formula like this:

y' = x' - xBut every time I try to run the model I get the error, «In evaluation, the identifier x is either undefined or not an operator.»

What is going on? Is it really not possible to write such formulas? why? How can I work around this?

Thanks.

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