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D( x )
x = 0
3*x+1 = 0
x = 0
x = 0
3*x+1 = 0
3*x+1 = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x in (-oo:-1/3) U (-1/3:0) U (0:+oo)
5/(3*x+1)+2/x = 0
(5*x)/(x*(3*x+1))+(2*(3*x+1))/(x*(3*x+1)) = 0
2*(3*x+1)+5*x = 0
11*x+2 = 0
(11*x+2)/(x*(3*x+1)) = 0
(11*x+2)/(x*(3*x+1)) = 0 // * x*(3*x+1)
11*x+2 = 0
11*x+2 = 0 // - 2
11*x = -2 // : 11
x = -2/11
x = -2/11
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