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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
120/x = 1.0714285714 // - 1.0714285714
120/x-1.0714285714 = 0
120*x^-1 = 1.0714285714 // : 120
x^-1 = 0.00892857
-1 < 0
1/(x^1) = 0.00892857 // * x^1
1 = 0.00892857*x^1 // : 0.00892857
112.00001792 = x^1
x = 112.00001792
x = 112.00001792
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