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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-(11/y)-3-1 = 0
5/x-11*y^-1-3-1 = 0
5*x^-1 = -(-11*y^-1-4) // : 5
x^-1 = (4-(-11*y^-1))/5
-1 < 0
1/(x^1) = (4-(-11*y^-1))/5 // * x^1
1 = x^1*((4-(-11*y^-1))/5) // : (4-(-11*y^-1))/5
5*(11*y^-1+4)^-1 = x^1
x = 5*(11*y^-1+4)^-1
x = 5*(11*y^-1+4)^-1
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