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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.25/15 = 0.75/x // - 0.75/x
0.25/15-(0.75/x) = 0
0.25/15-0.75*x^-1 = 0
-0.75*x^-1 = -0.01666667 // : -0.75
x^-1 = 0.02222223
-1 < 0
1/(x^1) = 0.02222223 // * x^1
1 = 0.02222223*x^1 // : 0.02222223
44.99998425 = x^1
x = 44.99998425
x = 44.99998425
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