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D( x )
x <= 0
x <= 0
x in (0:+oo)
log(27)(x) = 1/3 // - 1/3
log(27)(x)-(1/3) = 0
log(27)(x)-1/3 = 0
log(27)(x)-1/3 = 0 // + 1/3
log(27)(x) = 1/3
log(27)(x) = log(27)(27^(1/3))
x = 27^(1/3)
x = 3
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