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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x)/x-3 = 18/x-3+7 // - 18/x-3+7
(6*x)/x-(18/x)-7-3+3 = 0
(6*x)/x-18*x^-1-7-3+3 = 0
-18*x^-1 = 1 // : -18
x^-1 = -1/18
-1 < 0
1/(x^1) = -1/18 // * x^1
1 = -1/18*x^1 // : -1/18
-18 = x^1
x = -18
x = -18
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