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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.3 = 1425/x // - 1425/x
2.3-(1425/x) = 0
2.3-1425*x^-1 = 0
-1425*x^-1 = -2.3 // : -1425
x^-1 = 0.00161404
-1 < 0
1/(x^1) = 0.00161404 // * x^1
1 = 0.00161404*x^1 // : 0.00161404
619.56333176 = x^1
x = 619.56333176
x = 619.56333176
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