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D( y )
y^2 = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
3*y-((6*y^2)/(y^2))-12 = 0
3*y-12-6 = 0
3*y-18 = 0 // + 18
3*y = 18 // : 3
y = 18/3
y = 6
y = 6
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