Adalah ….
9³ˣ – 2.3³ˣ⁺¹ – 27 = 0
(3²)³ˣ – 2.3.3³ˣ – 27 = 0
(3³ˣ)² – 6 . 3³ˣ – 27 = 0
Misal: 3³ˣ = a
a² – 6a – 27 = 0
(a – 9)(a + 3) = 0
a = 9 ➝ 3³ˣ = 9 ➝ 3x = 2 ➝ x = 2/3
a = -3 (tidak menyanggupi)
Kaprikornus, himpunan penyelesaiannya 2/3