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en caso positivo
|9-3x| = 15
9-3x = 15
-3x = 15 - 9
x = 6 / -3
x = -2
en caso negativo
|9-3x| = 15
9-3x = -15
-3x = -15 - 9
x = -24 / -3
x = 8
la respuesta es la a)