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D( x )
19*x+5 = 0
19*x+5 = 0
19*x+5 = 0
19*x+5 = 0 // - 5
19*x = -5 // : 19
x = -5/19
x in (-oo:-5/19) U (-5/19:+oo)
(3-(2*x))/(19*x+5) = 0
(3-2*x)/(19*x+5) = 0
3-2*x = 0 // - 3
-2*x = -3 // : -2
x = -3/(-2)
x = 3/2
x = 3/2
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