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2 pangkat 2x-7 = 1/ 2 pangkat 5
2 pangkat 2x-7 = 2 pangkat -5
2x-7 = -5
2x = 2
x=2
2^2x-7 = 1/2^5
2^2x-7 = 2^-5
2x-7 = -5
2x = -5+7
2x = 2
x = 1