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Efectuando operaciones:
3x - 21 = 5x - 5 - 4
3x - 5x = - 5 - 4 + 21
- 2x = - 1 + 21
-2x = + 20
x = + 20 / - 2
x = - 10
5 (2 - x) + 3 (x + 6) = 10 - 4 (6 +2x)
Efectuando operaciones:
10 - 5x + 3x + 18 = 10 - 24 - 8x
- 2x +28 = - 8x - 14
- 2x + 8x = - 14 - 28
6x = - 42
x = - 42 / 6
x = - 7