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D( x )
x = 0
3/x-5+1 = 0
x = 0
x = 0
3/x-5+1 = 0
3/x-5+1 = 0
3*x^-1 = 4 // : 3
x^-1 = 4/3
-1 < 0
1/(x^1) = 4/3 // * x^1
1 = 4/3*x^1 // : 4/3
3/4 = x^1
x = 3/4
x in (-oo:0) U (0:3/4) U (3/4:+oo)
(4/x+6/x+1)/(3/x-5+1) = -1 // + 1
(4/x+6/x+1)/(3/x-5+1)+1 = 0
(10*x^-1+1)/(3*x^-1-4)+1 = 0
(10*x^-1+1)/(3*x^-1-4)+(1*(3*x^-1-4))/(3*x^-1-4) = 0
1*(3*x^-1-4)+10*x^-1+1 = 0
13*x^-1-3 = 0
(13*x^-1-3)/(3*x^-1-4) = 0
(13*x^-1-3)/(3*x^-1-4) = 0 // * 3*x^-1-4
13*x^-1-3 = 0
13*x^-1 = 3 // : 13
x^-1 = 3/13
-1 < 0
1/(x^1) = 3/13 // * x^1
1 = 3/13*x^1 // : 3/13
13/3 = x^1
x = 13/3
x = 13/3
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