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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(20-(3*x))/x = 2 // - 2
(20-(3*x))/x-2 = 0
(20-3*x)/x-2 = 0
(20-3*x)/x+(-2*x)/x = 0
20-3*x-2*x = 0
20-5*x = 0
(20-5*x)/x = 0
(20-5*x)/x = 0 // * x
20-5*x = 0
20-5*x = 0 // - 20
-5*x = -20 // : -5
x = -20/(-5)
x = 4
x = 4
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