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Verified answer
(1/10)^(x+2) = 10^2x= (10^-1)^(x+2) = 10^2x
= 10^(-x-2) = 10^2x
=> -x -2 = 2x
-x -2x = 2
-3x = 2
x = -2/3. (^ , berarti pangkat)