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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.71 = (x+999)/x // - (x+999)/x
0.71-((x+999)/x) = 0
(-1*(x+999))/x+0.71 = 0
(-1*(x+999))/x+(0.71*x)/x = 0
0.71*x-1*(x+999) = 0
-0.29*x-999 = 0
(-0.29*x-999)/x = 0
(-0.29*x-999)/x = 0 // * x
-0.29*x-999 = 0
-0.29*x-999 = 0 // + 999
-0.29*x = 999 // : -0.29
x = 999/(-0.29)
x = -3444.82758621
x = -3444.82758621
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