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D( x )
4*x+3 = 0
4*x+3 = 0
4*x+3 = 0
4*x+3 = 0 // - 3
4*x = -3 // : 4
x = -3/4
x in (-oo:-3/4) U (-3/4:+oo)
(5-(2*x))/(4*x+3) = 0
(5-2*x)/(4*x+3) = 0
5-2*x = 0 // - 5
-2*x = -5 // : -2
x = -5/(-2)
x = 5/2
x = 5/2
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