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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/2.5 = 25/x // - 25/x
7/2.5-(25/x) = 0
7/2.5-25*x^-1 = 0
-25*x^-1 = -2.8 // : -25
x^-1 = 0.112
-1 < 0
1/(x^1) = 0.112 // * x^1
1 = 0.112*x^1 // : 0.112
8.92857143 = x^1
x = 8.92857143
x = 8.92857143
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