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D( x )
x+40000 = 0
x+40000 = 0
x+40000 = 0
x+40000 = 0 // - 40000
x = -40000
x in (-oo:-40000) U (-40000:+oo)
x/(x+40000) = 0.2 // - 0.2
x/(x+40000)-0.2 = 0
x/(x+40000)+(-0.2*(x+40000))/(x+40000) = 0
x-0.2*(x+40000) = 0
0.8*x-8000 = 0
(0.8*x-8000)/(x+40000) = 0
(0.8*x-8000)/(x+40000) = 0 // * x+40000
0.8*x-8000 = 0
0.8*x-8000 = 0 // + 8000
0.8*x = 8000 // : 0.8
x = 8000/0.8
x = 10000
x = 10000
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