Respostas

2013-12-13T00:17:14-02:00
4[x+3]=20[x+3]=20/4
3x=5x=5/3x=1.67
2013-12-13T00:17:34-02:00
4x + 12 = 20
4x = 20 - 12
4x = 8
x = 8/4
x = 2
brigadu
acabou?
5z+2z-4+5=
7z = - 5 + 4 ===> 7z = -1 ====> z = -1/7
5z-4+7z+4=