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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1550 = 6.7/x // - 6.7/x
1550-(6.7/x) = 0
1550-6.7*x^-1 = 0
-6.7*x^-1 = -1550 // : -6.7
x^-1 = 231.34328358
-1 < 0
1/(x^1) = 231.34328358 // * x^1
1 = 231.34328358*x^1 // : 231.34328358
0.00432258 = x^1
x = 0.00432258
x = 0.00432258
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