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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20/3 = 50/x // - 50/x
20/3-(50/x) = 0
20/3-50*x^-1 = 0
-50*x^-1 = -20/3 // : -50
x^-1 = 2/15
-1 < 0
1/(x^1) = 2/15 // * x^1
1 = 2/15*x^1 // : 2/15
15/2 = x^1
x = 15/2
x = 15/2
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