Explicación paso a paso:
[tex] {x}^{2} + {x}^{2} - {x}^{2} + x - x + {x}^{2} - x - x = 2 {x}^{2} - 2x[/tex]
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Explicación paso a paso:
[tex] {x}^{2} + {x}^{2} - {x}^{2} + x - x + {x}^{2} - x - x = 2 {x}^{2} - 2x[/tex]