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5 (- x + 1) = 3x - (15 - 2x)
- 5x + 5 = 3x - 15 + 2x
- 5x + 5 = 5x - 15
- 5x - 5x = - 15 - 5
- 10x = - 20
x = - 20/-10
x = 2
Solución :
x = 2