If the third power of a is equal to the sixth power of - 8x and the ninth power of Y, what is a =? Come on

If the third power of a is equal to the sixth power of - 8x and the ninth power of Y, what is a =? Come on

If the third power of a is equal to the sixth power of - 8x and the ninth power of Y, then: a = - 2x & # 178; Y & # 179;