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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
90/27 = 200/x // - 200/x
90/27-(200/x) = 0
90/27-200*x^-1 = 0
-200*x^-1 = -10/3 // : -200
x^-1 = 1/60
-1 < 0
1/(x^1) = 1/60 // * x^1
1 = 1/60*x^1 // : 1/60
60 = x^1
x = 60
x = 60
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