Jawabanmu

2014-08-31T18:14:24+07:00
3^2x+1 = 27^3x-2√4
3^2x+1 = 3^3(3x-2√4)
2x+1 = 3(3x-2 . 2)
2x+1 = 3(3x - 4)
2x+1 = 9x-12
         = 9x - 12 -2x -1
         = 7x -13
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