Respostas

2014-02-19T20:47:36-03:00
3(x+2)+5x=x+12
3x+6+5x=x+12
3x+5x-x=12-6
7x=6
x=6/7
1 5 1
2014-02-19T20:48:02-03:00
3.( x + 2 ) + 5x = x + 12
3x + 6 + 5x= x + 12
8x - x = 12 - 6
7x = 6
x = 6/7
1 5 1