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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-(1/x)+5+5 = 0
7/x-x^-1+5+5 = 0
6*x^-1 = -10 // : 6
x^-1 = -5/3
-1 < 0
1/(x^1) = -5/3 // * x^1
1 = -5/3*x^1 // : -5/3
-3/5 = x^1
x = -3/5
x = -3/5
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