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20x - 12 - 20x + 28 = 2x - 1
20x - 20x - 12 + 28 = 2x - 1
16 = 2x - 1
- 2x = - 1 - 16
- 2x = - 17
x = -17/-2
x = 17/2
Solución :
x = 17/2