Respostas

2014-08-03T18:33:18-03:00
4(x+3)=20
4x+12=20
4x= 20 -12
4x= 8 
x= 8/4
x= 2
2 4 2
2014-08-03T19:18:52-03:00
4 (x+3)=20
4x+12=20
4x=20-12
4x=8
x=8/4
x=2