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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.5/4 = 5/x // - 5/x
1.5/4-(5/x) = 0
1.5/4-5*x^-1 = 0
-5*x^-1 = -0.375 // : -5
x^-1 = 0.075
-1 < 0
1/(x^1) = 0.075 // * x^1
1 = 0.075*x^1 // : 0.075
13.33333333 = x^1
x = 13.33333333
x = 13.33333333
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