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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-5/x-5 = 7 // - 7
-5/x-7-5 = 0
-5*x^-1 = 12 // : -5
x^-1 = -12/5
-1 < 0
1/(x^1) = -12/5 // * x^1
1 = -12/5*x^1 // : -12/5
-5/12 = x^1
x = -5/12
x = -5/12
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