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D( x )
9*x+6 = 0
6*x+4 = 0
9*x+6 = 0
9*x+6 = 0
9*x+6 = 0 // - 6
9*x = -6 // : 9
x = -6/9
x = -2/3
6*x+4 = 0
6*x+4 = 0
6*x+4 = 0 // - 4
6*x = -4 // : 6
x = -4/6
x = -2/3
x in (-oo:-2/3) U (-2/3:+oo)
3/(6*x+4) = 1/(9*x+6) // - 1/(9*x+6)
3/(6*x+4)-(1/(9*x+6)) = 0
3/(6*x+4)-(9*x+6)^-1 = 0
3/(6*x+4)-1/(9*x+6) = 0
(3*(9*x+6))/((6*x+4)*(9*x+6))+(-1*(6*x+4))/((6*x+4)*(9*x+6)) = 0
3*(9*x+6)-1*(6*x+4) = 0
21*x+14 = 0
(21*x+14)/((6*x+4)*(9*x+6)) = 0
(21*x+14)/((6*x+4)*(9*x+6)) = 0 // * (6*x+4)*(9*x+6)
21*x+14 = 0
21*x+14 = 0 // - 14
21*x = -14 // : 21
x = -14/21
x = -2/3
x in { -2/3}
x belongs to the empty set
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