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