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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.2/x = 15 // - 15
1.2/x-15 = 0
1.2*x^-1 = 15 // : 1.2
x^-1 = 12.5
-1 < 0
1/(x^1) = 12.5 // * x^1
1 = 12.5*x^1 // : 12.5
0.08 = x^1
x = 0.08
x = 0.08
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