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D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
(x+5)/(2*x) = 3 // - 3
(x+5)/(2*x)-3 = 0
(x+5)/(2*x)+(-3*2*x)/(2*x) = 0
x-3*2*x+5 = 0
5-5*x = 0
(5-5*x)/(2*x) = 0
(5-5*x)/(2*x) = 0 // * 2*x
5-5*x = 0
5-5*x = 0 // - 5
-5*x = -5 // : -5
x = -5/(-5)
x = 1
x = 1
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