3/4n - 18 = 1/4n - 4
3/4n -18= 1/4n -4⇒ 3/4n -1/4n= -4+18⇒ 2/4n= 14⇒ 1/2n= 14⇒ n= 14/(1/2)⇒ n= 14* (2/1)⇒ n= 28Final answer: n= 28~