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How to use FreeAbelianGroup?

fricas
Z ==> Integer
Type: Void
fricas
A==>FreeAbelianGroup(M)
Type: Void
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M==>Matrix Z
Type: Void
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m1 := matrix [[1,2],[3,4]]

\label{eq1}\left[ 
\begin{array}{cc}
1 & 2 
\
3 & 4 
(1)
Type: Matrix(Integer)
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m2 := matrix [[8,3]]

\label{eq2}\left[ 
\begin{array}{cc}
8 & 3 
(2)
Type: Matrix(Integer)
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m3 := matrix [[6],[7]]

\label{eq3}\left[ 
\begin{array}{c}
6 
\
7 
(3)
Type: Matrix(Integer)
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a1 := m1::A; a2:=m2::A;a3:=m3::A;
Type: FreeAbelianGroup?(Matrix(Integer))
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x1 := 2*a1+a2

\label{eq4}{\left[ 
\begin{array}{cc}
8 & 3 
(4)
Type: FreeAbelianGroup?(Matrix(Integer))
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x2 := 3*a1-5*a3

\label{eq5}\begin{array}{@{}l}
\displaystyle
-{5 \ {\left[ 
\begin{array}{c}
6 
\
7 
(5)
Type: FreeAbelianGroup?(Matrix(Integer))
fricas
x1+x2

\label{eq6}\begin{array}{@{}l}
\displaystyle
-{5 \ {\left[ 
\begin{array}{c}
6 
\
7 
(6)
Type: FreeAbelianGroup?(Matrix(Integer))




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