Respostas

2013-11-16T03:11:21-02:00
2X + 3 < 23
2X < 23 - 3
2X < 20
X < 20/2
X<10


5 - 4X < - 3
-4X < - 3 - 5
-4X < - 8           X( -1)
 4X < 8
X < 8/4
 X < 2
1 3 1