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D( x )
2*x-4.45 = 0
2*x-4.45 = 0
2*x-4.45 = 0
2*x-4.45 = 0 // + 4.45
2*x = 4.45 // : 2
x = 4.45/2
x = 2.225
x in (-oo:2.225) U (2.225:+oo)
-18/(2*x-4.45) = 0
-18 = 0
x belongs to the empty set
x belongs to the empty set
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