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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
170/x = 11+13 // - 11+13
170/x-13-11 = 0
170*x^-1 = 24 // : 170
x^-1 = 12/85
-1 < 0
1/(x^1) = 12/85 // * x^1
1 = 12/85*x^1 // : 12/85
85/12 = x^1
x = 85/12
x = 85/12
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