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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 3.75 // - 3.75
1/x-3.75 = 0
1*x^-1 = 3.75 // : 1
x^-1 = 3.75
-1 < 0
1/(x^1) = 3.75 // * x^1
1 = 3.75*x^1 // : 3.75
0.26666667 = x^1
x = 0.26666667
x = 0.26666667
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