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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/14 = 40/x // - 40/x
16/14-(40/x) = 0
16/14-40*x^-1 = 0
-40*x^-1 = -8/7 // : -40
x^-1 = 1/35
-1 < 0
1/(x^1) = 1/35 // * x^1
1 = 1/35*x^1 // : 1/35
35 = x^1
x = 35
x = 35
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