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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+3)/(2*x) = 5/8 // - 5/8
(x+3)/(2*x)-(5/8) = 0
(x+3)/(2*x)-5/8 = 0
(8*(x+3))/(2*8*x)+(-5*2*x)/(2*8*x) = 0
8*(x+3)-5*2*x = 0
24-2*x = 0
(24-2*x)/(2*8*x) = 0
(24-2*x)/(2*8*x) = 0 // * 2*8*x
24-2*x = 0
24-2*x = 0 // - 24
-2*x = -24 // : -2
x = -24/(-2)
x = 12
x = 12
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