Respostas

2013-09-01T15:57:16-03:00
3x - 1 = -13
3x = -13 + 1
3x = - 12
x = -4
2013-09-01T16:00:04-03:00
3x-1= -13
3x=-13+1
3x=-12
x= -12/3
x= -4