Common factor for 4 is 1, 2 and 4.
Common factor for 9 is 1, 3 and 9.
Both of these numbers only share 1.
7 is a multiple of 14. 7 can divide 14 perfectly without any remainder
Answer: option 3
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N - 2 / - 3 = - 6 (1) multiply both sides by -3 to get n - 2 alone
n - 2 = 18 (2) add 2 to both sides; 2 on left side gets cancelled so we can now have n all alone
n = 20