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2 pangkat 3x+1 = 2pangkat 7
2 di coret seblah kanan dan kiri
3x+1 = 7
7-1 = 3x
6 = 3x
x = 6/3
x=2
2 pangkat 2x+1 = 2 pangkat 7
2x+1 = 7
2x = 6
x = 3