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kita ingat bahwa
alogb=c
maka a pangkat c=b
jadi, 3log (4x-1) = 3
3pangkat 3=4x-1
27=4x-1
27+1=4x
4x=28
x=7
maka 3log(4x-1)=3
3log(4.7)-1)=3
3log27=3