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2x =7+1 --->karena pindah ruas
2x =8
x =8
2
x =4 --->hasil x setelah dibagi
ditanyakan 3^x-1 -----> ^=pangkat
=3^4-1 --->setelah dimasukan nilai x
=3^3
=27 ---->hasilnya
2x = 7 + 1
2x = 8
x = 8/2
x = 4
3^x-1 = 3^4-1 = 3^3 = 27