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f(x) = (2x -1)/(3x +4)
y = (2x -1) /(3x + 4)
y(3x +4) = 2x - 1
3xy + 4y = 2x - 1
3xy - 2x = -4y - 1
x(3y -2) = -4y -1
x = (-4y -1)/(3y-2)
f⁻¹ (x) = (-4x -1) /(3x -2)
atau
f⁻¹ (x)= (4x+1)/(-3x +2)