Respostas

2014-08-01T23:52:32-03:00
0,1x+3x+0.9x=14+2x
-2x+3x+1x=14
1x+1x=14
2x=14
x=14/2
x=7
2014-08-02T06:48:54-03:00
0,1x + 3x + 0,9x = 14 + 2x
4x - 2x = 14
2x = 14
x = 14:2
x = 7