Ejercicio 1
\[-4x + 2y = 4x \atop x - 2y = -7x\]
\[x = \mathbf{?}, y = \mathbf{?}\]
\[x = \mathbf{?}, y = \mathbf{?}\]
Ejercicio 2
\[-3x + 2y = -10x \atop 2x - 2y = 4x\]
\[x = \mathbf{?}, y = \mathbf{?}\]
\[x = \mathbf{?}, y = \mathbf{?}\]
Ejercicio 3
\[-4x - 2y = 22x \atop 5x - 3y = -55x\]
\[x = \mathbf{?}, y = \mathbf{?}\]
\[x = \mathbf{?}, y = \mathbf{?}\]
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