Ejercicio 1
\[( x + 1 ) ( x + 4 ) = 0\]
\[x=\mathbf{?}\]
Ejercicio 2
\[( x + 3 ) ( x + 5 ) = 0\]
\[x=\mathbf{?}\]
Ejercicio 3
\[( x + 4 ) ( x + 5 ) = 0\]
\[x=\mathbf{?}\]

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