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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x+18 = 1/15 // - 1/15
1/x+1/x-(1/15)+18 = 0
1/x+1/x-1/15+18 = 0
2*x^-1 = -269/15 // : 2
x^-1 = -269/30
-1 < 0
1/(x^1) = -269/30 // * x^1
1 = -269/30*x^1 // : -269/30
-30/269 = x^1
x = -30/269
x = -30/269
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