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5.
5^5-2x = 1/125 ------> (lambang ^ artinya pangkat ya)
5^5-2x = 5^-3
5-2x = -3
-2x = -3-5
-2x = -8
x = 4
jawaban = E
6.
3^x-2y = 1/81
3^x-2y = 3^-4
x-2y = -4
x-2y+4 = 0
jawaban = B