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D( x )
x <= 0
x <= 0
x in (0:+oo)
log(x)(1/36) = -2 // + 2
log(x)(1/36)+2 = 0
log(x)(1/36)+2 = 0 // - 2
log(x)(1/36) = -2
log(x)(1/36) = log(x)(x^-2)
1/36 = x^-2
-1*x^-2 = -1/36 // : -1
x^-2 = 1/36
-2 < 0
1/(x^2) = 1/36 // * x^2
1 = 1/36*x^2 // : 1/36
36 = x^2
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { -6}
x = 6
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