To find the Greatest Common Factor (GCF) of the expression \(18j + 27\), we need to factor out the common factors of the coefficients (18 and 27).
- The factors of 18 are: 1, 2, 3, 6, 9, 18.
- The factors of 27 are: 1, 3, 9, 27.
The common factors of 18 and 27 are 1, 3, and 9. The greatest of these is 9.
So, the GCF of \(18j + 27\) is 9.