Respuesta :

spammingallowed

Answer:

[tex] {x}^{2} - 4x = 7 {x}^{2} + 8x \\ {x}^{2} - 7 {x}^{2} = 8x + 4x \\ - 6 {x}^{2} = 12x \\ - 6x = 12 \\ x = \frac{12}{ - 6} = - 2 \\ x = - 2 \\ thank \: you[/tex]

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