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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1000/1500 = 1700/x // - 1700/x
1000/1500-(1700/x) = 0
1000/1500-1700*x^-1 = 0
-1700*x^-1 = -2/3 // : -1700
x^-1 = 1/2550
-1 < 0
1/(x^1) = 1/2550 // * x^1
1 = 1/2550*x^1 // : 1/2550
2550 = x^1
x = 2550
x = 2550
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