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D( x )
2*x+1 = 0
3*x-1 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in (-oo:-1/2) U (-1/2:1/3) U (1/3:+oo)
4/(2*x+1)-(1/(3*x-1)) = 5 // - 5
4/(2*x+1)-(1/(3*x-1))-5 = 0
4/(2*x+1)-(3*x-1)^-1-5 = 0
4/(2*x+1)-1/(3*x-1)-5 = 0
(4*(3*x-1))/((2*x+1)*(3*x-1))+(-1*(2*x+1))/((2*x+1)*(3*x-1))+(-5*(2*x+1)*(3*x-1))/((2*x+1)*(3*x-1)) = 0
4*(3*x-1)-1*(2*x+1)-5*(2*x+1)*(3*x-1) = 0
10*x-30*x^2-5*x-5+5 = 0
5*x-30*x^2 = 0
5*x-30*x^2 = 0
5*x*(1-6*x) = 0
1-6*x = 0 // - 1
-6*x = -1 // : -6
x = -1/(-6)
x = 1/6
5*x*(x-1/6) = 0
(5*x*(x-1/6))/((2*x+1)*(3*x-1)) = 0
(5*x*(x-1/6))/((2*x+1)*(3*x-1)) = 0 // * (2*x+1)*(3*x-1)
5*x*(x-1/6) = 0
( 5*x )
5*x = 0 // : 5
x = 0
( x-1/6 )
x-1/6 = 0 // + 1/6
x = 1/6
x in { 0, 1/6 }
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