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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-5/x-8 = 12 // - 12
-5/x-12-8 = 0
-5*x^-1 = 20 // : -5
x^-1 = -4
-1 < 0
1/(x^1) = -4 // * x^1
1 = -4*x^1 // : -4
-1/4 = x^1
x = -1/4
x = -1/4
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