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D( x )
x-6 = 0
3-x = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
3-x = 0
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x in (-oo:3) U (3:6) U (6:+oo)
3/(3-x)-(1/(x-6)) = 0
3/(3-x)-(x-6)^-1 = 0
3/(3-x)-1/(x-6) = 0
(3*(x-6))/((3-x)*(x-6))+(-1*(3-x))/((3-x)*(x-6)) = 0
3*(x-6)-1*(3-x) = 0
4*x-21 = 0
(4*x-21)/((3-x)*(x-6)) = 0
(4*x-21)/((3-x)*(x-6)) = 0 // * (3-x)*(x-6)
4*x-21 = 0
4*x-21 = 0 // + 21
4*x = 21 // : 4
x = 21/4
x = 21/4
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