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log x/15 = log 0,2
x/15 = 0,2
x = 3
2. ²log(3x-5) - ²log (x+2)=1
²log(3x-5)/(x+2) = ²log2
(3x - 5)/(x+2) = 2
3x - 5 = 2x + 4
3x - 2x = 4 + 5
x = 9
3. log x^2 + ^5 log (x-3)=...
untuk soal no 3 (kurang jelas) tuliskan lagi di tempat komentar nanti saya teruskan