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2014-04-28T22:36:30+03:00
x²+(x+2)²+(x+4)²=4(3x+8)
x
² + x²+4x+4 + x²+8x+16 = 12x + 32
3x² + 12x + 20 = 12x + 32
12x cu 12x se reduc

3x²+20=32
3x²=12
x²=4

=> x= plus minus 2
1 5 1