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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 50/x+2 // - 50/x+2
8/x-(50/x)-2 = 0
8/x-50*x^-1-2 = 0
-42*x^-1 = 2 // : -42
x^-1 = -1/21
-1 < 0
1/(x^1) = -1/21 // * x^1
1 = -1/21*x^1 // : -1/21
-21 = x^1
x = -21
x = -21
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