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F^-1 =
y = 3x-12/5
5y = 3x-12
3x = 5y + 12
x =
y diganti x =
= 7
5x + 12 = 21
5x = 21-12
5x = 9
x = 9/5
disubtitusi kedalam rumus F(X)
F(9/5) = 3/5 (9/5-4/1)
=3/5 (9/5-20/5)
=3/5 (-11/5)
= -33/25