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D( x )
3*x+6 = 0
9*x = 0
3*x+6 = 0
3*x+6 = 0
3*x+6 = 0 // - 6
3*x = -6 // : 3
x = -6/3
x = -2
9*x = 0
9*x = 0
9*x = 0 // : 9
x = 0
x in (-oo:-2) U (-2:0) U (0:+oo)
5/(3*x+6) = 2/(9*x) // - 2/(9*x)
5/(3*x+6)-(2/(9*x)) = 0
5/(3*x+6)+(-2/9)*x^-1 = 0
5/(3*x+6)-2/(9*x) = 0
(5*9*x)/(9*x*(3*x+6))+(-2*(3*x+6))/(9*x*(3*x+6)) = 0
5*9*x-2*(3*x+6) = 0
39*x-12 = 0
(39*x-12)/(9*x*(3*x+6)) = 0
(39*x-12)/(9*x*(3*x+6)) = 0 // * 9*x*(3*x+6)
39*x-12 = 0
39*x-12 = 0 // + 12
39*x = 12 // : 39
x = 12/39
x = 4/13
x = 4/13
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