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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11*(420/x)-66 = 600 // - 600
11*(420/x)-600-66 = 0
4620*x^-1 = 666 // : 4620
x^-1 = 111/770
-1 < 0
1/(x^1) = 111/770 // * x^1
1 = 111/770*x^1 // : 111/770
770/111 = x^1
x = 770/111
x = 770/111
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