Respostas

2014-08-20T15:30:03-03:00
2x-100=15
2x=15+100
2x=115
x=115/2
x=
1 4 1
2014-08-20T15:42:32-03:00
100- 2x= 15
-2x = 15-100
-2x = -85 (-1)
2x = 85
 x = 85/2
 x= 42,5
1 5 1