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D( x )
x-6 = 0
x-2 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:6) U (6:+oo)
(6*x)/(x-2)-((7*x)/(x-6)) = 0
(6*x)/(x-2)-7*x*(x-6)^-1 = 0
(6*x)/(x-2)+(-7*x)/(x-6) = 0
(6*x*(x-6))/((x-2)*(x-6))+(-7*x*(x-2))/((x-2)*(x-6)) = 0
6*x*(x-6)-7*x*(x-2) = 0
-x^2-22*x = 0
-x^2-22*x = 0
-x*(x+22) = 0
x+22 = 0 // - 22
x = -22
-x*(x+22) = 0
(-x*(x+22))/((x-2)*(x-6)) = 0
(-x*(x+22))/((x-2)*(x-6)) = 0 // * (x-2)*(x-6)
-x*(x+22) = 0
( -x )
-1*x = 0 // : -1
x = 0
( x+22 )
x+22 = 0 // - 22
x = -22
x in { 0, -22 }
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