Log expression

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[lone tinsel]

if you do find the answer, please let me know im interested

[quaint oasis]

i got 2 as a final answer

using a basic log rules and algebra. Key notes are to put everything in log2 and log5

log20 = log4 + log5 = 2log2 + log5
log8 = 3log2
log(1/4) = -2log2
(a + b)^3 = (a + b)(a^2 - ab + b^2)
sum of cubes useful to help simplify the first two terms a bit

[median shadow]

@zenith oyster has given 1 rep to @quaint oasis