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2014-04-23T21:21:11+03:00
9x²-2*2*3x+2²+4²-2*4*6x+36x²=0
45x²-12x+20-48x=0
45x²-60x+20=0 |:5>0
9x²-12x+4=0
(3x-2)²=0
3x=2
x₁=x₂= \frac{2}{3}
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