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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36/x = 3*y // - 3*y
36/x-(3*y) = 0
36/x-3*y = 0
36*x^-1 = -(-3*y) // : 36
x^-1 = y/12
-1 < 0
1/(x^1) = y/12 // * x^1
1 = x^1*(y/12) // : y/12
12*y^-1 = x^1
x = 12*y^-1
x = 12*y^-1
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