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3^(x+2) + 3^2(x+1) = 3^6 + 3^4
x +2 + 2x +2 = 6+4
3x+4 = 10
3x = 6
x= 6/3 = 2
maka 3^(x-4)= 3^(2-4) = 3^-2 = 1/9