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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7.5/30 = 16/x // - 16/x
7.5/30-(16/x) = 0
7.5/30-16*x^-1 = 0
-16*x^-1 = -0.25 // : -16
x^-1 = 0.015625
-1 < 0
1/(x^1) = 0.015625 // * x^1
1 = 0.015625*x^1 // : 0.015625
64 = x^1
x = 64
x = 64
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