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D( x )
x-7 = 0
x-4 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:7) U (7:+oo)
x/(x-4) = (x-6)/(x-7) // - (x-6)/(x-7)
x/(x-4)-((x-6)/(x-7)) = 0
x/(x-4)+(-1*(x-6))/(x-7) = 0
(x*(x-7))/((x-4)*(x-7))+(-1*(x-6)*(x-4))/((x-4)*(x-7)) = 0
x*(x-7)-1*(x-6)*(x-4) = 0
3*x-24 = 0
(3*x-24)/((x-4)*(x-7)) = 0
(3*x-24)/((x-4)*(x-7)) = 0 // * (x-4)*(x-7)
3*x-24 = 0
3*x-24 = 0 // + 24
3*x = 24 // : 3
x = 24/3
x = 8
x = 8
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