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2014-07-06T22:00:26+03:00
4x²-4x+1 +9y²+12y +4=0

(2x-1)²+(3y+2)²=0

2x-1=0   ∧   3y+2=0

2x=1               3y=-2

x=1/2               y= -2/3
1 2 1