Respostas

2014-06-03T00:37:37-03:00
3x-1 = 2
3x = 2+1
3x = 3
x = 3/3
x = 1

x +1 # 2
x # 2-1
x # 1

2x + 3 < 1
2x < 1 - 3
2x < -2
x < -2/2
x < -1

x + 2 < 1
x < 1 - 2
x < -1