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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/(3*x-1) = 6/(2*x+1) // - 6/(2*x+1)
4/(3*x-1)-(6/(2*x+1)) = 0
4/(3*x-1)-6*(2*x+1)^-1 = 0
4/(3*x-1)-6/(2*x+1) = 0
(4*(2*x+1))/((3*x-1)*(2*x+1))+(-6*(3*x-1))/((3*x-1)*(2*x+1)) = 0
4*(2*x+1)-6*(3*x-1) = 0
10-10*x = 0
(10-10*x)/((3*x-1)*(2*x+1)) = 0
(10-10*x)/((3*x-1)*(2*x+1)) = 0 // * (3*x-1)*(2*x+1)
10-10*x = 0
10-10*x = 0 // - 10
-10*x = -10 // : -10
x = -10/(-10)
x = 1
x = 1
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