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X: El número buscado.
RESOLVIENDO:
3X - 15 = -3
3X = 15 - 3
3X = 12
X = 4 ===> El número buscado. RESPUESTA
COMPROBACIÓN:
3(4) - 15 = - 3
12 - 15 = - 3
- 3 = -3
MUCHA SUERTE...!!!