Respostas

2014-08-28T15:14:23-03:00
17x+40=21x
17x-21x=-40
-4x=-40
x=-40/-4
x= 10
bjs!
1 5 1
2014-08-28T15:16:56-03:00
17x+40=21x
17x-21X=-40
4X=40   
X=40/4
X=10
1 5 1