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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.1/15 = 9.7/x // - 9.7/x
1.1/15-(9.7/x) = 0
1.1/15-9.7*x^-1 = 0
-9.7*x^-1 = -0.07333333 // : -9.7
x^-1 = 0.00756014
-1 < 0
1/(x^1) = 0.00756014 // * x^1
1 = 0.00756014*x^1 // : 0.00756014
132.27268278 = x^1
x = 132.27268278
x = 132.27268278
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