Respostas

2014-02-20T19:35:15-03:00
Letra a : 

2x - 3 = 17
2x = 17 + 3
2x = 20
x = 20 / 2
x = 10

Letra b : 

5 - 2x = -13
-2x = -13 - 5
-2x = -18
2x = 18
x = 18 / 2
x = 9

Letra c : 

2x + 11 = 1
2x = 1 - 11
2x = -10
x = -10 / 2
x = -5

Letra d : 

7 + 4x = -3
4x = -3 - 7
4x = -10
x = -10 / 4
x = -5 / 2

Letra e : 

5 - 9x = -1
-9x = -1 - 5
-9x = -6
9x = 6
x = 6 / 9
x = 2 / 3
1 5 1