Jika f-1(2x-1)=8-6x, maka f(x)=
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2x - 1 = f(8 - 6x)
misal: y = 8 - 6x
f(y) = 2((8 - y)/6) - 1
= ((8 - y) - 3)/3
= (5 - y)/3
f(x) = (5 - x)/3