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5⁴/5ˣ = 1/0,2ˣ
5ˣ = 5⁴.0,2ˣ
⁵log 5ˣ = ⁵log (5⁴.0,2ˣ) = ⁵log 5⁴ + ⁵log 0,2ˣ
x = 4 + x.⁵log 0,2
x - x.⁵log 0,2 = 4
x(1 - ⁵log 0,2) = 4
x = 4/(1 - ⁵log 0,2) (⁵log 0,2 =⁵log 1/5 = ⁵log 5⁻¹ = -1)
x = 4/(1-(-1)) = 4/2 = 2
jadi HP = {2}