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D( x )
5*x+9 = 0
5*x+9 = 0
5*x+9 = 0
5*x+9 = 0 // - 9
5*x = -9 // : 5
x = -9/5
x in (-oo:-9/5) U (-9/5:+oo)
(3*x-8)/(5*x+9) = 0
3*x-8 = 0 // + 8
3*x = 8 // : 3
x = 8/3
x = 8/3
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