Solve using Excel Iteration

Here $12$ Equation and $12$ umknowns and input values for the Excel sheet are.

$m,n,k,l,,P,a_s$

Fos Example, $m=1,n=4,k=0,L=0,=1\mathrm{.}2$

$P=101325,a_s=1\mathrm{.}5$ find values.

ner Write code in step by step. for Excel sheet