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D( x )
x-6 = 0
5*x-30 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
5*x-30 = 0
5*x-30 = 0
5*x-30 = 0 // + 30
5*x = 30 // : 5
x = 30/5
x = 6
x in (-oo:6) U (6:+oo)
-(7/(x-6)) = -(1/(5*x-30))^1 // + (1/(5*x-30))^1
(1/(5*x-30))^1-(7/(x-6)) = 0
1/(5*x-30)-7*(x-6)^-1 = 0
1/(5*x-30)-7/(x-6) = 0
(-7*(5*x-30))/((x-6)*(5*x-30))+(1*(x-6))/((x-6)*(5*x-30)) = 0
1*(x-6)-7*(5*x-30) = 0
204-34*x = 0
(204-34*x)/((x-6)*(5*x-30)) = 0
(204-34*x)/((x-6)*(5*x-30)) = 0 // * (x-6)*(5*x-30)
204-34*x = 0
204-34*x = 0 // - 204
-34*x = -204 // : -34
x = -204/(-34)
x = 6
x in { 6}
x belongs to the empty set
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