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D( x )
x-7 = 0
5-x = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
5-x = 0
5-x = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x in (-oo:5) U (5:7) U (7:+oo)
5/(5-x)-(1/(x-7)) = 0
5/(5-x)-(x-7)^-1 = 0
5/(5-x)-1/(x-7) = 0
(5*(x-7))/((5-x)*(x-7))+(-1*(5-x))/((5-x)*(x-7)) = 0
5*(x-7)-1*(5-x) = 0
6*x-40 = 0
(6*x-40)/((5-x)*(x-7)) = 0
(6*x-40)/((5-x)*(x-7)) = 0 // * (5-x)*(x-7)
6*x-40 = 0
6*x-40 = 0 // + 40
6*x = 40 // : 6
x = 40/6
x = 20/3
x = 20/3
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