Question

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Answer 1

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3 log(2x) = 4
log (2x)^3 = 4
raise both sides to the power of 10
(2x)^3 = 10^4
(2x) = (10^4)^(1/3)

Answer 2

Same answer - different sequence:

First divide both sides by 3

log 2x = 4/3

10 to power both sides:
2x = 10^ (4/3)