This is how you go about it:
ley f(x) be y therefore the equation will be y=5x-4
switch x for y , the equation will be x=5y-4
divide both sides by 5........ x/5=y-4/5
therefore, x/5+4/5=y...............hence y=x/5+4/5
the inverse of f(x)=(x+4)/5
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