Respostas

2014-04-07T19:46:35-03:00
2x+12=4x+8
2x+12-4x=8
-2x+12=8
-2x+12-8=
-2x+4=
-2x=-4
x=-4/-2
x= -2
2014-04-07T19:47:12-03:00
2x+12 = 4x+8
2x-4x = 8-12
-2x = -4
x= -4/2
x=-2