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f-1(x)=..
..
y=(3x+4)/(5x-2)
y.(5x-2)=3x+4
5xy-2y=3x+4
5xy-3x=2y+4
x(5y-3)=2y+4
x=(2y+4)/(5y-3)
..
f-1(x)=(2x+4)/(5x-3)
thanks