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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x+3 = 12 // - 12
18/x-12+3 = 0
18*x^-1 = 9 // : 18
x^-1 = 1/2
-1 < 0
1/(x^1) = 1/2 // * x^1
1 = 1/2*x^1 // : 1/2
2 = x^1
x = 2
x = 2
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