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