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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y+5/x = -1/4 // + -1/4
Y+5/x-(-1/4) = 0
Y+5/x+1/4 = 0
5*x^-1 = -(Y+1/4) // : 5
x^-1 = (-(Y+1/4))/5
-1 < 0
1/(x^1) = (-(Y+1/4))/5 // * x^1
1 = x^1*((-(Y+1/4))/5) // : (-(Y+1/4))/5
-5*(Y+1/4)^-1 = x^1
x = -5*(Y+1/4)^-1
x = -5*(Y+1/4)^-1
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