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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36.9/104 = 3210/x // - 3210/x
36.9/104-(3210/x) = 0
36.9/104-3210*x^-1 = 0
-3210*x^-1 = -0.35480769 // : -3210
x^-1 = 0.00011053
-1 < 0
1/(x^1) = 0.00011053 // * x^1
1 = 0.00011053*x^1 // : 0.00011053
9047.31747037 = x^1
x = 9047.31747037
x = 9047.31747037
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