(x-6)(x-9)
I did that by factoring 54 until I found two numbers that added up to 15.
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2a^3 + 54 can first be factored into 2 (a^3 + 27). This can then be factored out to 2 (a + 3) (a^2 - 3a + 9).
It is: 126 plus 54 = 180
45 + x + 54 + x 2x + 99
54 is a multiple of 6. (6*9)
54 + 78 = 132