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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/12 = 80/x // - 80/x
10/12-(80/x) = 0
10/12-80*x^-1 = 0
-80*x^-1 = -5/6 // : -80
x^-1 = 1/96
-1 < 0
1/(x^1) = 1/96 // * x^1
1 = 1/96*x^1 // : 1/96
96 = x^1
x = 96
x = 96
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