Respostas

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2013-08-23T18:21:28-03:00
2x+y+1=8           2x+2+x=8              x-y=-2
x-y=-2                3x+2=8                  2-y=-2
                          x=2                       -y=-2-2
                                                    (-1). -y=-4 .(-1)
                                                        y=4

                                                        
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