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^ adalah pangkat
(1/4)^(1-3x) = 8^(x+2)
(2^-2)^(1-3x) = (2^3)^(x+2)
2^-2×(1-3x) = 2^3×(x+2)
maka
-2(1-3x) = 3(x+2)
-2 + 6x = 3x + 6
3x = 8
x = 2.67