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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
22.5/9 = 36/x // - 36/x
22.5/9-(36/x) = 0
22.5/9-36*x^-1 = 0
-36*x^-1 = -2.5 // : -36
x^-1 = 0.06944444
-1 < 0
1/(x^1) = 0.06944444 // * x^1
1 = 0.06944444*x^1 // : 0.06944444
14.40000092 = x^1
x = 14.40000092
x = 14.40000092
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