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-2x=12
x=-6
3(x - 7) = 5(x - 1) - 4
3x - 21 = 5x - 5 - 4
- 21+ 5 + 4 = 5x - 3x
- 21 + 9 = 2x
- 12 = 2x
- 12/2 = x
- 6 = x
x = - 6
Respuesta.
x = - 6