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y = (7x + 1)/(2x - 5)
y(2x - 5) = 7x + 1
2xy - 5y = 7x + 1
2xy - 7x = 5y + 1
x(2y - 7) = 5y + 1
x = (5y + 1)/(2y - 7)
ganti x dengan f⁻¹(x) dan y dengan x
f⁻¹(x) = (5x + 1)/(2x - 7)
1 n0 aja ya kebanyakan kalo semua