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(m o n)^-1 (x) = 2 - 3x
misal y = 2 - 3x
=> 3x = 2 - y
=> x = (2 - y)/3
(m o n)(x) = (2 - x)/3
m(n(x)) = (2 - x)/3
(4n(x) - 1)/(2n(x) + 3) = (2 - x)/3 ....... kali silang
12n(x) - 3 = 4n(x) - 2xn(x) + 6 - 3x
12n(x) - 4n(x) + 2xn(x) = 6 - 3x + 3
n(x) (12 - 4 + 2x) = 9 - 3x
n(x) = (9 - 3x)/(8 + 2x)