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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-53/x-8 = 0
-53*x^-1 = 8 // : -53
x^-1 = -8/53
-1 < 0
1/(x^1) = -8/53 // * x^1
1 = -8/53*x^1 // : -8/53
-53/8 = x^1
x = -53/8
x = -53/8
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