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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x = 0.3/5 // - 0.3/5
9/x-(0.3/5) = 0
9/x-0.06 = 0
9*x^-1 = 0.06 // : 9
x^-1 = 0.00666667
-1 < 0
1/(x^1) = 0.00666667 // * x^1
1 = 0.00666667*x^1 // : 0.00666667
149.999925 = x^1
x = 149.999925
x = 149.999925
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