If that's 12x + 18, that can be factored to 6(2x + 3)
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If you are looking for common factors of 12x and 9 it would be 3.
12,24,36,48,60,72,84,96,108,120,132,144
Assuming the missing signs are pluses, that factors to (x + 6)(x + 6)
GCF = 12x.24x = 2(12x)36x3 = 3x2(12x)
The factors of 18 are 1,2,3,6,9 and 18. For them to be common, they need to be compared to another set of factors.