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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/3 = 7.5/x // - 7.5/x
5/3-(7.5/x) = 0
5/3-7.5*x^-1 = 0
-7.5*x^-1 = -5/3 // : -7.5
x^-1 = 0.22222222
-1 < 0
1/(x^1) = 0.22222222 // * x^1
1 = 0.22222222*x^1 // : 0.22222222
4.50000005 = x^1
x = 4.50000005
x = 4.50000005
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