Respostas

2014-05-21T20:51:37-03:00
4 - x = 4x
-x - 4x = -4
-5x = -4
x = -4/-5
x = 4/5
3 4 3
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2014-05-21T20:52:22-03:00
4 - x = 4x
- 4x - x = - 4
- 5x = - 4 . ( - 1 )
5x = 4
x = 4/5 = 0,8
4 5 4