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4^x+1 = akar 8^x+5
(2^2)^x+1 = akar (2^3)^x+5
2^(2x+2) = akar 2^(3x+15)
2^(2x+2) = 2^(3x+15)/2
maka,
2x+2 = (3x+15)/2
2(2x+2) = 3x + 15
4x+4 = 3x + 15
x = 11
^ = tanda pangkat