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D( x )
x+5 = 0
x-3 = 0
2*x-6 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x in (-oo:-5) U (-5:3) U (3:+oo)
(((4*x+20)/(x-3))/(x+5))/(2*x-6) = 0
(4*x+20)/((x-3)*(x+5)*(2*x-6)) = 0
4*x+20 = 0 // - 20
4*x = -20 // : 4
x = -20/4
x = -5
x in { -5}
x belongs to the empty set
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