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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/5 = 120/x // - 120/x
8/5-(120/x) = 0
8/5-120*x^-1 = 0
-120*x^-1 = -8/5 // : -120
x^-1 = 1/75
-1 < 0
1/(x^1) = 1/75 // * x^1
1 = 1/75*x^1 // : 1/75
75 = x^1
x = 75
x = 75
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