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= 2 pangkat 2x - 1 4 pangkat x-1 = 4 pangkat x : 8 pangkat x-1
= 2 pangkat 2x - 1 2 pangkat 2x-2 = 2 pangkat 2x : 2 pngkat 3x-3
= 2x -1 + 2x -2 = 2x - 3x -3
= 2x+2x -1 -3 = -x-3
= 4x - 4 = - x - 3
= 4x +x = -3 +4
= 5x = 1
= x = 1