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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
60/x = 6.9 // - 6.9
60/x-6.9 = 0
60*x^-1 = 6.9 // : 60
x^-1 = 0.115
-1 < 0
1/(x^1) = 0.115 // * x^1
1 = 0.115*x^1 // : 0.115
8.69565217 = x^1
x = 8.69565217
x = 8.69565217
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