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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x-8+8 = 1/x+15 // - 1/x+15
1/x+1/x-(1/x)-15-8+8 = 0
1/x+1/x-x^-1-15-8+8 = 0
1*x^-1 = 15 // : 1
x^-1 = 15
-1 < 0
1/(x^1) = 15 // * x^1
1 = 15*x^1 // : 15
1/15 = x^1
x = 1/15
x = 1/15
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