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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
43/x+57+62 = 55 // - 55
43/x-55+57+62 = 0
43*x^-1 = -64 // : 43
x^-1 = -64/43
-1 < 0
1/(x^1) = -64/43 // * x^1
1 = -64/43*x^1 // : -64/43
-43/64 = x^1
x = -43/64
x = -43/64
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