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