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y - 6 = 3x
× = y-6/3
f-1(x) = x-6 /3
misalkan f (x) = y
f (x) = 3x + 6
y = 3x + 6
3x = y - 6
x = y/3 - 6/3
x = y/3 - 2
f invers (x) = 1/3x - 2