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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-(5/y) = -22 // + 22
6/x-(5/y)+22 = 0
6/x-5*y^-1+22 = 0
6*x^-1 = -(22-5*y^-1) // : 6
x^-1 = (-(22-5*y^-1))/6
-1 < 0
1/(x^1) = (-(22-5*y^-1))/6 // * x^1
1 = x^1*((-(22-5*y^-1))/6) // : (-(22-5*y^-1))/6
-6*(22-5*y^-1)^-1 = x^1
x = -6*(22-5*y^-1)^-1
x = -6*(22-5*y^-1)^-1
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