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D( x )
x <= 0
x <= 0
x in (0:+oo)
ln(120*(-1/100)) = ln(x) // - ln(x)
ln(120*(-1/100))-ln(x) = 0
ln(-6/5)-ln(x) = 0 // - ln(-6/5)
-ln(x) = -ln(-6/5)
-ln(x) = -ln(-6/5) // * -1
x = -6/5
x in { -6/5}
x belongs to the empty set
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