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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
120/x = 100 // - 100
120/x-100 = 0
120*x^-1 = 100 // : 120
x^-1 = 5/6
-1 < 0
1/(x^1) = 5/6 // * x^1
1 = 5/6*x^1 // : 5/6
6/5 = x^1
x = 6/5
x = 6/5
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