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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/7 = 4.8/x // - 4.8/x
16/7-(4.8/x) = 0
16/7-4.8*x^-1 = 0
-4.8*x^-1 = -16/7 // : -4.8
x^-1 = 0.47619048
-1 < 0
1/(x^1) = 0.47619048 // * x^1
1 = 0.47619048*x^1 // : 0.47619048
2.09999998 = x^1
x = 2.09999998
x = 2.09999998
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