Find a basis of the row space of the matrix

A $=\backslash$left$[\backslash$begin$\{$array$\}\{$ccccc$\}$

$-2$ &$5$ &$7$ &$4$ &$-2\backslash$cr

$0$ &$-9$ &$-9$ &$-12$ &$8\backslash$cr

$2$ &$1$ &$-1$ &$4$ &$-3\backslash$cr

$0$ &$-3$ &$-3$ &$-4$ &$3$

$\backslash$end$\{$array$\}\backslash$right$].$

Basis:

$\backslash$big$\backslash$lbrace $\backslash$left$[\backslash$vrule width $0$pt height $1$em depth $0$pt$\backslash$right$.\backslash$left$]\backslash$vrule width $0$pt height $1$em depth $0$pt$\backslash$right$.,$

$\backslash$left$[\backslash$vrule width $0$pt height $1$em depth $0$pt$\backslash$right$.\backslash$left$]\backslash$vrule width $0$pt height $1$em depth $0$pt$\backslash$right$.,$

$\backslash$left$[\backslash$vrule width $0$pt height $1$em depth $0$pt$\backslash$right$.\backslash$left$]\backslash$vrule width $0$pt height $1$em depth $0$pt$\backslash$right$.\backslash$big$\backslash$rbrace$.$