Answer
$x = e^{3 - \ln 2} $
Work Step by Step
$3 + 4 \ln (2x) = 15$
$4\ln (2x) = 15-3$
$4\ln (2x) = 12$
$\ln (2x) = 3$
$\ln 2 + \ln x = 3$
$\ln x = 3 - \ln 2$
$e^{3 - \ln 2} = x $
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