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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-2.3 = -(1400/x) // + 1400/x
1400/x-2.3 = 0
1400*x^-1 = 2.3 // : 1400
x^-1 = 0.00164286
-1 < 0
1/(x^1) = 0.00164286 // * x^1
1 = 0.00164286*x^1 // : 0.00164286
608.69459357 = x^1
x = 608.69459357
x = 608.69459357
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