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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/20 = 3/x // - 3/x
15/20-(3/x) = 0
15/20-3*x^-1 = 0
-3*x^-1 = -3/4 // : -3
x^-1 = 1/4
-1 < 0
1/(x^1) = 1/4 // * x^1
1 = 1/4*x^1 // : 1/4
4 = x^1
x = 4
x = 4
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