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2x - 12 (x - 3) = 4 (x - 2x)
2x - 12x + 36 = 4x - 8x
- 10x + 36 = - 4x
- 10x + 4x = - 36
- 6x = - 36
x = - 36/-6
x = 6
Respuesta.
x = 6