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log( 2. log ( x+2) )= log(log 16x)
log(log(x+2)^2) = log(log 16x)
(x+2)^2 = 16 x
x^2+4x+4 = 16x
x^2-12x+4=0
jadi x1. x2 = c/a = 4/1=4