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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = -15/10 // + -15/10
18/x-(-15/10) = 0
18/x+3/2 = 0
18*x^-1 = -3/2 // : 18
x^-1 = -1/12
-1 < 0
1/(x^1) = -1/12 // * x^1
1 = -1/12*x^1 // : -1/12
-12 = x^1
x = -12
x = -12
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