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El doble = 2x
x - 15 = 2 (x - 3)
x - 15 = 2x - 6
x - 2x = - 6 + 15
- x = 9
x = - 9
Solución : El número es - 9
COMPROBAMOS :
x - 15 = 2 (x - 3)
- 9 - 15 = 2 (- 9 - 3)
- 24 = - 18 - 6
- 24 = - 24
La solución es correcta.