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(p - 6)(p - 2) = 5
p^2 - 8p + 12 = 5
p^2 - 8p + 7 = 0
(p-7)(p-1) = 0
p = 7 atau p = 1
p = 7 => 7^(2x+1) = 7^1
2x + 1 = 1
2x = 0
x = 0
p = 1 => 7^(2x+1) = 7^0
2x + 1 = 0
2x = -1
x = -1/2
Maka,
(p - 6)(p - 2) = 5
p² - 8p + 12 = 5
p² - 8p + 7 = 0
(p - 7)(p - 1) = 0
Untuk p = 7,
7²ˣ⁺¹ = 7¹
2x + 1 = 1
2x = 0
Jadi x = 0
Untuk p = 1.
7²ˣ⁺¹ = 7⁰
2x + 1 = 0
Jadi x = -1/2