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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-((2*x)/x) = 3*x // - 3*x
1-(3*x)-((2*x)/x) = 0
1-3*x-2 = 0
-3*x-1 = 0 // + 1
-3*x = 1 // : -3
x = 1/(-3)
x = -1/3
x = -1/3
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