You have to replace the matrix/vector indices you have user by literal indices (the ones you get by typing the period). You cannot use the comma in a variable name.
Then assign a guess value to every variable you are going to search for.
After that type the word "Given" in a math region
Follow this by all your equations (at first glance it looks to me that you are short of one equation).
Finish that solve block by typing "find(variable1, variable2,......)="
According to one of your equation you have h.L=h.L1=h.L2, so I suggest you just use h.L and when you have solved you may define h.L1:=h.L.
A.1 and A.2 can be directly calculated above the solve block and you should do so (by using the :=)
V.dot, W.elect and h.pump can be simply calculated and defined after the solve block - no need to make the solve block to search for them, too.
You can also set equal the two expressions for h.L1 and h.L2 and that way have not h.L or hL1, h.L2 in your seolve block - you can also calculate the, afterwards.
After doing all of that you still have just 7 equations for 8 unknowns (V, V.dot, Re and f; all with index 1 and 2)
