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D( x )
6*x = 0
(6*(1-(6*x)))/(6*x)+6 = 0
6*x = 0
6*x = 0
6*x = 0 // : 6
x = 0
(6*(1-(6*x)))/(6*x)+6 = 0
(6*(1-(6*x)))/(6*x)+6 = 0
(6*(1-6*x))/(6*x)+6 = 0
(6*(1-6*x))/(6*x)+(6*6*x)/(6*x) = 0
6*(1-6*x)+6*6*x = 0
6 = 0
6/(6*x) = 0
6/(6*x) = 0 // * 6*x
6 = 0
x in (-oo:0) U (0:+oo)
1/((6*(1-(6*x)))/(6*x)+6) = 0
1/((6*(1-6*x))/(6*x)+6) = 0
(6*(1-6*x))/(6*x)+6 = 0
(6*(1-6*x))/(6*x)+(6*6*x)/(6*x) = 0
6*(1-6*x)+6*6*x = 0
6 = 0
6/(6*x) = 0
6/(6*x) = 0 // * 6*x
6 = 0
1/6 = 0
x belongs to the empty set
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