Splitting a long equation please help

Question

I am using this:
documentclass[12pt,letter paper] {article}
usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}
usepackage[english]{babel}
usepackage{graphicx}
usepackage[capposition=top]{floatrow}
usepackage[a4paper,left=25mm,top=25mm,top=25mm,bottom=25mm]{geometry}
usepackage{amsmath}
begin{document}

begin{align*}
    {LogTAXREV}_{it} = {alpha_{0}}+{beta_{1}LogGDPPC_{it}}
    +{beta_{2}LogTRADE_{it}}+{beta_{3}LogRESOURCE_{it}}
   +{beta_{4}LogAGRIC_{it}}+{beta_{5}LogSERVICE_{it}}
   +{beta_{6}LogAGE_{it}}+{beta_{7}LogPOP_{it}}
   +{beta_{8}LogEDUC_{it}}+{beta_{9}LogGINI_{it}}
end{align*}

end{document}

I get this error: Argument of @fileswith@pti@ns has an extra } on the amsmath usepackage and my equation does not split.

egreg · Answer

Line 1: letter paper should be letterpaper, but you can omit it altogether, since you're declaring a4paper later.
Line 2: with a recent release of LaTeX available, this can be omitted.
Line 7: you're missing a trailing {geometry}, which is the cause of the first error you get.
In the main part, all those emph declarations are wrong. And TeX won't split the long equation for you.
documentclass[12pt] {article}
%usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}
usepackage[english]{babel}
usepackage{graphicx}
usepackage[capposition=top]{floatrow}
usepackage[a4paper,left=25mm,top=25mm,top=25mm,bottom=25mm]{geometry}
usepackage{amsmath}

begin{document}

begin{align*}
  mathit{LogTAXREV}_{mathrm{it}} = alpha_{0}
  &+beta_{1}mathit{LogGDPPC}_{mathrm{it}}
   +beta_{2}mathit{LogTRADE}_{mathrm{it}}
  
  &+beta_{3}mathit{LogRESOURCE}_{mathrm{it}}
   +beta_{4}mathit{LogAGRIC}_{mathrm{it}}
  
  &+beta_{5}mathit{LogSERVICE}_{mathrm{it}}
   +beta_{6}mathit{LogAGE}_{mathrm{it}}
  
  &+beta_{7}mathit{LogPOP}_{mathrm{it}}
   +beta_{8}mathit{LogEDUC}_{mathrm{it}}
  
  &+beta_{9}mathit{LogGINI}_{mathrm{it}}
end{align*}

end{document}

Splitting a long equation please help

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