Respostas

2014-04-03T21:55:28-03:00
20x + 19 - 5x = 7x + 31 + 2x

20x - 5x - 7x - 2x = 31 - 19

6x = 12

x = 12/6

x= 2
1 5 1
2014-04-03T22:12:25-03:00
20x+19-5x=7x+31+2x
20x-5x-7x-2x=31-19
6x=12
x=12/6, logo x=2
espero ter ajudado