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D( x )
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
3/(2*x-1)-(5/(2*x-1)) = 0
3/(2*x-1)-5*(2*x-1)^-1 = 0
3/(2*x-1)-5/(2*x-1) = 0
3-5 = 0
-2 = 0
-2/(2*x-1) = 0
-2/(2*x-1) = 0 // * 2*x-1
-2 = 0
x belongs to the empty set
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