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In order to find which equation has the solution of n = 22, plug in the value of 22 for n in each equation and see which one works.
1. n−15=7+15
22 - 15 = 7 + 15
7 = 22, this equation is false.
2. n+16=18+20
22 + 16 = 18 + 20
38 = 38, this equation is true.
3. 3n−28=38−14
3(22) - 28 = 38 - 14
66 - 28 = 24
38 = 24, this equation is false.
4. n+16=38−15
22 + 16 = 38 - 15
38 = 23, this equation is false.
Therefore, the equation n+16=18+20 has the solution of n = 22.