Respostas

2014-07-16T12:49:43-03:00
A) 2x +5 = 27
2x = 27 - 5
2x = 22
x = 22/2
x = 11 

b) 4x - 8 = 2x + 6 
4x - 2x = 6+8
2x = 14
x = 14/2
x = 7

c) 7x + 1 = 6x + 6 
7x - 6x = 6 -1
x = 5

d) 5x - 3 = 2x - 9
5x - 2x = -9 +3
3x = -6
x = -6/3
x = -2 

1 5 1