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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-28/5 = 28/x+8 // - 28/x+8
-(28/x)-28/5-8 = 0
-28*x^-1-28/5-8 = 0
-28*x^-1 = 68/5 // : -28
x^-1 = -17/35
-1 < 0
1/(x^1) = -17/35 // * x^1
1 = -17/35*x^1 // : -17/35
-35/17 = x^1
x = -35/17
x = -35/17
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