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y=2x-4
y+4=2x / :2
(y-4)/2=x
Zamieniamy zmienne: y= 1/2*(x-4)
f(x)=x^-1 dla x<- <0.nieskonczonosci)
y= x^-1
y=1/x obie strony razy x
xy=1
x= 1/y
x= y^-1
zamieniamy zmienne: y = x^-1