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