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3)
6 - x = 4(x - 3) - 7(x - 4)
6 - x = 4x - 12 - 7x + 28
6 - x = 4x - 7x - 12 + 28
6 - x = - 3x + 16
- x + 3x = 16 - 6
2x = 10
x = 10/2
x = 5
El valor de x es : 5.