Respostas

2014-03-20T13:34:45-03:00
5x + 10 = 40
5x = 40 - 10
5x = 30
x = 30 / 5
x = 6


6x + 5 = 2x  - 5
6x - 2x = -5 - 5
4x = -10
x = -10 / 4   =  -5/2
1 5 1
2014-03-20T14:18:12-03:00
1- 5x=40-10
    5x=30
    x=30/5
    x=6
2- 6x-2x=-5-5
    4x=-10
    x=-10
/4
     x=-2,5
espero ter ajudado