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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)
(4*x-20)/(2*x) = 16 // - 16
(4*x-20)/(2*x)-16 = 0
(4*x-20)/(2*x)+(-16*2*x)/(2*x) = 0
4*x-16*2*x-20 = 0
-28*x-20 = 0
(-28*x-20)/(2*x) = 0
(-28*x-20)/(2*x) = 0 // * 2*x
-28*x-20 = 0
-28*x-20 = 0 // + 20
-28*x = 20 // : -28
x = 20/(-28)
x = -5/7
x = -5/7
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