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D( x )
5*x-15 = 0
15-x = 0
5*x-15 = 0
5*x-15 = 0
5*x-15 = 0 // + 15
5*x = 15 // : 5
x = 15/5
x = 3
15-x = 0
15-x = 0
15-x = 0 // - 15
-x = -15 // * -1
x = 15
x in (-oo:3) U (3:15) U (15:+oo)
1/(5*x-15) = 1/(15-x) // - 1/(15-x)
1/(5*x-15)-(1/(15-x)) = 0
1/(5*x-15)-(15-x)^-1 = 0
1/(5*x-15)-1/(15-x) = 0
(1*(15-x))/((5*x-15)*(15-x))+(-1*(5*x-15))/((5*x-15)*(15-x)) = 0
1*(15-x)-1*(5*x-15) = 0
30-6*x = 0
(30-6*x)/((5*x-15)*(15-x)) = 0
(30-6*x)/((5*x-15)*(15-x)) = 0 // * (5*x-15)*(15-x)
30-6*x = 0
30-6*x = 0 // - 30
-6*x = -30 // : -6
x = -30/(-6)
x = 5
x = 5
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