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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-1.645 = (15-12)/x // - (15-12)/x
-((15-12)/x)-1.645 = 0
-3*x^-1 = 1.645 // : -3
x^-1 = -0.54833333
-1 < 0
1/(x^1) = -0.54833333 // * x^1
1 = -0.54833333*x^1 // : -0.54833333
-1.82370822 = x^1
x = -1.82370822
x = -1.82370822
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