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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/66 = 1/54 // - 1/54
1/x+1/66-(1/54) = 0
1/x+1/66-1/54 = 0
1*x^-1 = 1/297 // : 1
x^-1 = 1/297
-1 < 0
1/(x^1) = 1/297 // * x^1
1 = 1/297*x^1 // : 1/297
297 = x^1
x = 297
x = 297
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