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D( x )
x+4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:+oo)
(2*x-3)/(x+4) = 0
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
x = 3/2
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