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3x - 7 - 8x + 16 = 5x - 1
- 5x + 9 = 5x - 1
- 5x - 5x = - 1 - 9
- 10x = - 10
x = -10/-10
x = 1
Solución :
x = 1
Es la opción A)
El opuesto de 1 es = - 1