Respostas

2013-12-03T17:12:54-02:00
2x+10=x+12
2x-x=12-10
x=2

resposta 3) - 2
2013-12-03T18:03:47-02:00
X + 2x + 10 = x + 12
3x - x = 12 -10
2x = 2
x = 2/2
x = 1