Respostas

2014-08-27T00:06:06-03:00
3(x-2) - (1-x) = 13
3x - 6 - 1 + x = 13
4x -7 = 13
4x = 13 + 7
4x = 20
x = 20/4
x = 5
2014-08-27T00:07:50-03:00
3 ( x - 2 ) - ( 1 - x ) = 13

3x - 6 - 1 + x = 13

3x + x = 13 + 6 + 1

4x = 20

x = 20/4

x = 5

Tenha bons estudos !