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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50/x = -16 // + 16
50/x+16 = 0
50*x^-1 = -16 // : 50
x^-1 = -8/25
-1 < 0
1/(x^1) = -8/25 // * x^1
1 = -8/25*x^1 // : -8/25
-25/8 = x^1
x = -25/8
x = -25/8
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