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D( x )
2*x-4.5 = 0
2*x-4.5 = 0
2*x-4.5 = 0
2*x-4.5 = 0 // + 4.5
2*x = 4.5 // : 2
x = 4.5/2
x = 2.25
x in (-oo:2.25) U (2.25:+oo)
(330-(6*x))/(2*x-4.5) = 0
(330-6*x)/(2*x-4.5) = 0
330-6*x = 0 // - 330
-6*x = -330 // : -6
x = -330/(-6)
x = 55
x = 55
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