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D( x )
(x^2*y)/12 = 0
(x^2*y)/12 = 0
(x^2*y)/12 = 0
1/12*x^2*y = 0 // : 1/12*y
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
((3*((5*x)/2)*y)/4)/((x^2*y)/12) = 0
45/2*x^-1 = 0 // : 45/2
x^-1 = 0
x należy do O
x belongs to the empty set
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