Respostas

2013-09-09T14:37:53-03:00
2x-3=9-x
2x +x -3= 9
3x=9+3
x= 12/3
x=4
1 5 1
2013-09-09T14:38:54-03:00
2 x - 3 = 9 - x
2 x + x = 9 + 3 
3 x = 12 
x = 12/3
x = 4 
1 5 1