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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13*34-(88/x) = 408 // - 408
13*34-(88/x)-408 = 0
13*34-88*x^-1-408 = 0
-88*x^-1 = -34 // : -88
x^-1 = 17/44
-1 < 0
1/(x^1) = 17/44 // * x^1
1 = 17/44*x^1 // : 17/44
44/17 = x^1
x = 44/17
x = 44/17
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