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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
35/x+35/60 = 1 // - 1
35/x+35/60-1 = 0
35*x^-1 = 5/12 // : 35
x^-1 = 1/84
-1 < 0
1/(x^1) = 1/84 // * x^1
1 = 1/84*x^1 // : 1/84
84 = x^1
x = 84
x = 84
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