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log xᵇ = b log x
5ˣ⁻² = 4
5ˣ⁻² = 2²
log 5ˣ⁻² = log 2²
(x-2) log 5 = 2 log 2
(x-2) = (2 log 2)/(log 5)
x = (2 log 2)/(log 5) + 2
x = (0,602/0,698) + 2
x = 0,8625 + 2
x = 2,8625