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D( x )
x-7 = 0
x-3 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:7) U (7:+oo)
6/(x-3)-(2/(x-7)) = 0
6/(x-3)-2*(x-7)^-1 = 0
6/(x-3)-2/(x-7) = 0
(6*(x-7))/((x-3)*(x-7))+(-2*(x-3))/((x-3)*(x-7)) = 0
6*(x-7)-2*(x-3) = 0
4*x-36 = 0
(4*x-36)/((x-3)*(x-7)) = 0
(4*x-36)/((x-3)*(x-7)) = 0 // * (x-3)*(x-7)
4*x-36 = 0
4*x-36 = 0 // + 36
4*x = 36 // : 4
x = 36/4
x = 9
x = 9
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