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Propiedad:
x - 4 = 3x - 8 o x - 4 = - (3x - 8)
- 4 + 8 = 3x - x x - 4 = - 3x + 8
4 = 2x x + 3x = 8 + 4
2 = x 4x = 12
x = 3
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