Tolong dijawab beserta cara penyelesaiannya ya??

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