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