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y = x +1/2x-4
2xy - 4y = x + 1
2xy - x = 4y + 1
x (2y -1) = 4y + 1
x = 4y + 1/ 2y - 1
dengan syarat
2y - 1≠ 0
2y ≠ 1
y ≠ 1/2
maka nilai dari invers
f⁻¹ = 4x + 1/ 2x-1 , x ≠ 1/2