subtitusi : ^3 log x = a
<= 2 (yang diluar logaritma) = ^{3} log 3^{2}
<= bisa pake sifat log yang kayak gini :
a = 18 - 3a
4a = 18
a = 18/4 = 9/2 <= a = ^{3} log x
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subtitusi : ^3 log x = a
<= 2 (yang diluar logaritma) = ^{3} log 3^{2}
<= bisa pake sifat log yang kayak gini :
a = 18 - 3a
4a = 18
a = 18/4 = 9/2 <= a = ^{3} log x