Respostas

2014-07-22T12:46:32-03:00
5x = 2x + 3
5x - 2x = 3
3x = 3
x = 3
     3
x = 1

3(2 - 2x) = - 7x
6 - 6x = - 7x
- 6x + 7x = - 6
x = - 6

4(2 - 2x) + 7x = 5(3 + 2x)
8 - 8x + 7x = 15 + 10x
- 8x + 7x - 10x = 15 - 8
- x - 10x = 7
- 11x = 7 .(- 1)
11x = - 7
x = - 7
      11

6(x - 3) = (7x + 1) - 16
6x - 18 = 7x + 1 - 16
6x - 7x = 1 - 16 + 18
- x = - 15 + 18
- x = 3 .(- 1)
x = - 3
1 5 1