Issues with solve block

Hi.

Iv been trying to solve this question using solve blocks for quite some time with no success. It would be great to receive some help if possible.

23-Emerald IV

You have at least one undefined variable: Tsi.

You're using = (boolean comparison) where probably you need to use := (assignment).

If you correct that, you'll probably find another undefined variable: Tso

Success!
Luc

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