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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/1.75 = 16/x // - 16/x
3/1.75-(16/x) = 0
3/1.75-16*x^-1 = 0
-16*x^-1 = -1.71428571 // : -16
x^-1 = 0.10714286
-1 < 0
1/(x^1) = 0.10714286 // * x^1
1 = 0.10714286*x^1 // : 0.10714286
9.33333308 = x^1
x = 9.33333308
x = 9.33333308
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