In legacy Mathcad versions such as PTC Mathcad 15, you start Solve Blocks with a "Given" statement.
In PTC Mathcad Prime, the Solve Block parts remain the same: guess values / input values, constraints, and the solver. However, the new structure comes under the form of a predefined rectangular construct that shows the exact places where you need to insert your conditions and math.
Watch this video for explanations on how to adjust Solve Blocks after converting your legacy Mathcad files, and subscribe to this channel for more videos in this conversion differences series.
You can convert your legacy Mathcad files into Mathcad Prime using our 30-day free trial of Mathcad Prime. Download that at https://www.mathcad.com/trial
We recently went into significant detail on powering up your worksheets using Solve Blocks at the Mathcad Virtual Conference 2023. You can check out the recording (and downloadable worksheets used) here: http://ptc.co/T2wQ50PIvxW