Solveblock error "a function or variable name is required here"

This is a thermal design project where we need to find the flow rates through multiple pipes. There are 25 flow rates I am looking for.

I'm not sure where the problem is. I have tried entering the variables in comma form (Q1, Q2, ...) and that produced an error as well.

I'm not very savvy with MathCAD so a descriptive answer would be appreciated.