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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-(3/y) = 2 // - 2
2/x-(3/y)-2 = 0
2/x-3*y^-1-2 = 0
2*x^-1 = -(-3*y^-1-2) // : 2
x^-1 = (2-(-3*y^-1))/2
-1 < 0
1/(x^1) = (2-(-3*y^-1))/2 // * x^1
1 = x^1*((2-(-3*y^-1))/2) // : (2-(-3*y^-1))/2
2*(3*y^-1+2)^-1 = x^1
x = 2*(3*y^-1+2)^-1
x = 2*(3*y^-1+2)^-1
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