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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18.75/x = 2.5 // - 2.5
18.75/x-2.5 = 0
18.75*x^-1 = 2.5 // : 18.75
x^-1 = 0.13333333
-1 < 0
1/(x^1) = 0.13333333 // * x^1
1 = 0.13333333*x^1 // : 0.13333333
7.50000019 = x^1
x = 7.50000019
x = 7.50000019
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