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Question: Why does my code return a blank?

Question:Why does my code return a blank?

Bennyjay 10 Maple 2023
solve rootfinding fsolve
April 05 2023
2

I've been trying for so long to fix my code I could've done the math by hand by now. All equations and variables seem to be recognized correctly. Can anyone point out where I made an error? Thanks

Chem.mw

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restart; K1 := 10^(-2.12); K2 := 10^(-7.21); K3 := 10^(-12.32); Kw := 10^(-14); NaCl := .5004/(58.44); NaH2PO4 := .1092/(119.98); Na2HPO4 := 1.214/(141.96); Why := Kw = H*OH; Do := K1 = H*H2PO4/H3PO4; It := K2 = H*HPO4/H2PO4; Today := K3 = H*PO4/HPO4; When := Cl = NaCl; Its := Na = NaH2PO4+2*Na2HPO4+NaCl; Due := Na+H = Cl+3*PO4+2*HPO4+H2PO4+OH; Tomorrow := Na2HPO4+NaH2PO4 = H3PO4+H2PO4+HPO4+PO4; z := solve([Why, Do, It, Today, When, Its, Due, Tomorrow], [H, OH, Na, CL, PO4, HPO4, H2PO4, H3PO4]); assign(z)

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