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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.6 = 45/x // - 45/x
3.6-(45/x) = 0
3.6-45*x^-1 = 0
-45*x^-1 = -3.6 // : -45
x^-1 = 0.08
-1 < 0
1/(x^1) = 0.08 // * x^1
1 = 0.08*x^1 // : 0.08
12.5 = x^1
x = 12.5
x = 12.5
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