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D( x )
5*x-10 = 0
18*x = 0
5*x-10 = 0
5*x-10 = 0
5*x-10 = 0 // + 10
5*x = 10 // : 5
x = 10/5
x = 2
18*x = 0
18*x = 0
18*x = 0 // : 18
x = 0
x in (-oo:0) U (0:2) U (2:+oo)
(((12*x^2)/(5*x-10))*(x-2))/(18*x) = 0
(12*x^2*(x-2))/(18*x*(5*x-10)) = 0
( 12*x^2 )
12*x^2 = 0 // : 12
x^2 = 0
x = 0
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 0}
x in { 2}
x belongs to the empty set
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