Respostas

2013-04-15T23:23:36-03:00

-5+8=x-2

-5+8+2=x

x=10-5

x=5

 

 

quando muda de lugar muda de sinal.

2013-04-15T23:30:33-03:00

-5 + 8 : x - 2

3 : x -2

x = -3 . (-2)

x = -6