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D( x )
x+1000 = 0
x+1000 = 0
x+1000 = 0
x+1000 = 0 // - 1000
x = -1000
x in (-oo:-1000) U (-1000:+oo)
(0.75*x)/(x+1000) = 0.003 // - 0.003
(0.75*x)/(x+1000)-0.003 = 0
(0.75*x)/(x+1000)+(-0.003*(x+1000))/(x+1000) = 0
0.75*x-0.003*(x+1000) = 0
0.747*x-3 = 0
(0.747*x-3)/(x+1000) = 0
(0.747*x-3)/(x+1000) = 0 // * x+1000
0.747*x-3 = 0
0.747*x-3 = 0 // + 3
0.747*x = 3 // : 0.747
x = 3/0.747
x = 4.01606426
x = 4.01606426
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