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2. 3 log 105= 3 log 3+3 log 7+3 log 5
karena 3x5x7=105.
prinsipnya sama dg soal nmr 1
jadi 3log 3=1
3log7=1,1771
3 log 5=1,465
tinggal ditambah
lalu dapet 3, 6421
3. 6x+3-5x-5=0
x-2=0
x=2
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