Respuestas

2013-08-09T02:08:30+02:00
1)
2(x + 3) = x + 7
2x + 6 = x + 7
2x - x = 7 - 6
x = 1

2)
x + 2 = 8
x = 8 - 2
x = 6

3)
2x = 8
x = 8/2
x = 4

4)
2x + 2 = 8
2x = 8 - 2
2x = 6
x = 6/2
x = 3

5)
(x + 3) = 8
x = 8 - 3
x = 5