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